Get the full URL in PHP

Have a look at $_SERVER['REQUEST_URI'], i.e.

$actual_link = "http://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

(Note that the double quoted string syntax is perfectly correct)

If you want to support both HTTP and HTTPS, you can use

$actual_link = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] === 'on' ? "https" : "http") . "://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

Editor's note: using this code has security implications. The client can set HTTP_HOST and REQUEST_URI to any arbitrary value it wants.

---

Short version to output link on a webpage

$url =  "//{$_SERVER['HTTP_HOST']}{$_SERVER['REQUEST_URI']}";

$escaped_url = htmlspecialchars( $url, ENT_QUOTES, 'UTF-8' );
echo '<a href="' . $escaped_url . '">' . $escaped_url . '</a>';

Here are some more details about the issues and edge cases of the //example.com/path/ format

Full version

function url_origin( $s, $use_forwarded_host = false )
{
    $ssl      = ( ! empty( $s['HTTPS'] ) && $s['HTTPS'] == 'on' );
    $sp       = strtolower( $s['SERVER_PROTOCOL'] );
    $protocol = substr( $sp, 0, strpos( $sp, '/' ) ) . ( ( $ssl ) ? 's' : '' );
    $port     = $s['SERVER_PORT'];
    $port     = ( ( ! $ssl && $port=='80' ) || ( $ssl && $port=='443' ) ) ? '' : ':'.$port;
    $host     = ( $use_forwarded_host && isset( $s['HTTP_X_FORWARDED_HOST'] ) ) ? $s['HTTP_X_FORWARDED_HOST'] : ( isset( $s['HTTP_HOST'] ) ? $s['HTTP_HOST'] : null );
    $host     = isset( $host ) ? $host : $s['SERVER_NAME'] . $port;
    return $protocol . '://' . $host;
}

function full_url( $s, $use_forwarded_host = false )
{
    return url_origin( $s, $use_forwarded_host ) . $s['REQUEST_URI'];
}

$absolute_url = full_url( $_SERVER );
echo $absolute_url;

This is a heavily modified version of http://snipplr.com/view.php?codeview&id=2734 (Which no longer exists)

URL structure:

scheme://username:password@domain:port/path?query_string#fragment_id

The parts in bold will not be included by the function

Notes:

This function does not include username:password from a full URL or the fragment (hash).

It will not show the default port 80 for HTTP and port 443 for HTTPS.

Only tested with http and https schemes.

The #fragment_id is not sent to the server by the client (browser) and will not be added to the full URL.

$_GET will only contain foo=bar2 for an URL like /example?foo=bar1&foo=bar2.

Some CMS's and environments will rewrite $_SERVER['REQUEST_URI'] and return /example?foo=bar2 for an URL like /example?foo=bar1&foo=bar2, use $_SERVER['QUERY_STRING'] in this case.

Keep in mind that an URI = URL + URN, but due to popular use, URL now means both URI and URL.

You should remove HTTP_X_FORWARDED_HOST if you do not plan to use proxies or balancers.

The spec says that the Host header must contain the port number unless it is the default number.

Client (Browser) controlled variables:

$_SERVER['REQUEST_URI']. Any unsupported characters are encoded by the browser before they are sent.

$_SERVER['HTTP_HOST'] and is not always available according to comments in the PHP manual: http://php.net/manual/en/reserved.variables.php

$_SERVER['HTTP_X_FORWARDED_HOST'] gets set by balancers and is not mentioned in the list of $_SERVER variables in the PHP manual.

Server controlled variables:

$_SERVER['HTTPS']. The client chooses to use this, but the server returns the actual value of either empty or "on".

$_SERVER['SERVER_PORT']. The server only accepts allowed numbers as ports.

$_SERVER['SERVER_PROTOCOL']. The server only accepts certain protocols.

$_SERVER['SERVER_NAME'] . It is set manually in the server configuration and is not available for IPv6 according to kralyk.

Related:

What is the difference between HTTP_HOST and SERVER_NAME in PHP?
Is Port Number Required in HTTP "Host" Header Parameter?
https://stackoverflow.com/a/28049503/175071

---

Examples for: https://(www.)example.com/subFolder/myfile.php?var=blabla#555

// ======= PATHINFO ====== //
$x = pathinfo($url);
$x['dirname']      🡺 https://example.com/subFolder
$x['basename']     🡺                               myfile.php?var=blabla#555 // Unsecure! 
$x['extension']    🡺                                      php?var=blabla#555 // Unsecure! 
$x['filename']     🡺                               myfile

// ======= PARSE_URL ====== //
$x = parse_url($url);
$x['scheme']       🡺 https
$x['host']         🡺         example.com
$x['path']         🡺                    /subFolder/myfile.php
$x['query']        🡺                                          var=blabla
$x['fragment']     🡺                                                     555

//=================================================== //
//========== self-defined SERVER variables ========== //
//=================================================== //
$_SERVER["DOCUMENT_ROOT"]  🡺 /home/user/public_html
$_SERVER["SERVER_ADDR"]    🡺 143.34.112.23
$_SERVER["SERVER_PORT"]    🡺 80(or 443 etc..)
$_SERVER["REQUEST_SCHEME"] 🡺 https                                         //similar: $_SERVER["SERVER_PROTOCOL"] 
$_SERVER['HTTP_HOST']      🡺         example.com (or with WWW)             //similar: $_SERVER["SERVER_NAME"]
$_SERVER["REQUEST_URI"]    🡺                       /subFolder/myfile.php?var=blabla
$_SERVER["QUERY_STRING"]   🡺                                             var=blabla
__FILE__                   🡺 /home/user/public_html/subFolder/myfile.php
__DIR__                    🡺 /home/user/public_html/subFolder              //same: dirname(__FILE__)
$_SERVER["REQUEST_URI"]    🡺                       /subFolder/myfile.php?var=blabla
parse_url($_SERVER["REQUEST_URI"], PHP_URL_PATH)🡺  /subFolder/myfile.php 
$_SERVER["PHP_SELF"]       🡺                       /subFolder/myfile.php

// ==================================================================//
//if "myfile.php" is included in "PARENTFILE.php" , and you visit  "PARENTFILE.PHP?abc":
$_SERVER["SCRIPT_FILENAME"]🡺 /home/user/public_html/parentfile.php
$_SERVER["PHP_SELF"]       🡺                       /parentfile.php
$_SERVER["REQUEST_URI"]    🡺                       /parentfile.php?var=blabla
__FILE__                   🡺 /home/user/public_html/subFolder/myfile.php

// =================================================== //
// ================= handy variables ================= //
// =================================================== //
//If site uses HTTPS:
$HTTP_or_HTTPS = ((!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS']!=='off') || $_SERVER['SERVER_PORT']==443) ? 'https://':'http://' );            //in some cases, you need to add this condition too: if ('https'==$_SERVER['HTTP_X_FORWARDED_PROTO'])  ...

//To trim values to filename, i.e. 
basename($url)             🡺 myfile.php

//excellent solution to find origin
$debug_files = debug_backtrace();       
$caller_file = count($debug_files) ? $debug_files[count($debug_files) - 1]['file'] : __FILE__;

Notice ! ! !

hashtag # parts were manually used in the above example just for illustration purposes, however, server-side languages (including php) can't natively detect them (Only Javascript can do that, as hashtag is only browser/client side functionality ).

DIRECTORY_SEPARATOR returns \ for Windows-type hosting, instead of /.

For WordPress

//(let's say, if wordpress is installed in subdirectory:  http://example.com/wpdir/)
home_url()                      🡺 http://example.com/wpdir/        //if is_ssl() is true, then it will be "https"
get_stylesheet_directory_uri()  🡺 http://example.com/wpdir/wp-content/themes/THEME_NAME  [same: get_bloginfo('template_url') ]
get_stylesheet_directory()      🡺 /home/user/public_html/wpdir/wp-content/themes/THEME_NAME
plugin_dir_url(__FILE__)        🡺 http://example.com/wpdir/wp-content/themes/PLUGIN_NAME
plugin_dir_path(__FILE__)       🡺 /home/user/public_html/wpdir/wp-content/plugins/PLUGIN_NAME/  

---

Here's a solution using a ternary statement, keeping the code minimal:

$url = "http" . (($_SERVER['SERVER_PORT'] == 443) ? "s" : "") . "://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];

This is the smallest and easiest way to do this, assuming one's web server is using the standard port 443 for HTTPS.

---

My favorite cross platform method for finding the current URL is:

$url = (isset($_SERVER['HTTPS']) ? "https" : "http") . "://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

---

Simply use:

$uri = $_SERVER['REQUEST_SCHEME'] . '://' . $_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']

---

function full_path()
{
    $s = &$_SERVER;
    $ssl = (!empty($s['HTTPS']) && $s['HTTPS'] == 'on') ? true:false;
    $sp = strtolower($s['SERVER_PROTOCOL']);
    $protocol = substr($sp, 0, strpos($sp, '/')) . (($ssl) ? 's' : '');
    $port = $s['SERVER_PORT'];
    $port = ((!$ssl && $port=='80') || ($ssl && $port=='443')) ? '' : ':'.$port;
    $host = isset($s['HTTP_X_FORWARDED_HOST']) ? $s['HTTP_X_FORWARDED_HOST'] : (isset($s['HTTP_HOST']) ? $s['HTTP_HOST'] : null);
    $host = isset($host) ? $host : $s['SERVER_NAME'] . $port;
    $uri = $protocol . '://' . $host . $s['REQUEST_URI'];
    $segments = explode('?', $uri, 2);
    $url = $segments[0];
    return $url;
}

Note: I just made an update to Timo Huovinen's code, so you won't get any GET parameters in the URL. This URL is plain and removes things like ?hi=i&am=a&get.

Example:

http://www.example.com/index?get=information

will be shown as:

http://www.example.com/index

This is fine unless you use GET paramaters to define some specific content, in which case you should use his code! :-)

---

Clear code, working in all webservers (Apache, nginx, IIS, ...):

$url = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' ? 'https' : 'http') . '://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];

---

HTTP_HOST and REQUEST_URI must be in quotes, otherwise it throws an error in PHP 7.2

Use:

$actual_link = 'https://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];

If you want to support both HTTP and HTTPS:

$actual_link = (isset($_SERVER['HTTPS']) ? 'https' : 'http').'://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];

---

Same technique as the accepted answer, but with HTTPS support, and more readable:

$current_url = sprintf(
    '%s://%s/%s',
    isset($_SERVER['HTTPS']) ? 'https' : 'http',
    $_SERVER['HTTP_HOST'],
    $_SERVER['REQUEST_URI']
);

The above gives unwanted slashes. On my setup Request_URI has leading and trailing slashes. This works better for me.

$Current_Url = sprintf(
   '%s://%s/%s',
   isset($_SERVER['HTTPS']) ? 'https' : 'http',
   $_SERVER['HTTP_HOST'],
   trim($_SERVER['REQUEST_URI'],'/\\')
);

---

Here is my solution - code is inspired by Tracy Debugger. It was changed for support different server ports. You can get full current URL including $_SERVER['REQUEST_URI'] or just the basic server URL. Check my function:

function getCurrentUrl($full = true) {
    if (isset($_SERVER['REQUEST_URI'])) {
        $parse = parse_url(
            (isset($_SERVER['HTTPS']) && strcasecmp($_SERVER['HTTPS'], 'off') ? 'https://' : 'http://') .
            (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : (isset($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME'] : '')) . (($full) ? $_SERVER['REQUEST_URI'] : null)
        );
        $parse['port'] = $_SERVER["SERVER_PORT"]; // Setup protocol for sure (80 is default)
        return http_build_url('', $parse);
    }
}

Here is test code:

// Follow $_SERVER variables was set only for test
$_SERVER['HTTPS'] = 'off'; // on
$_SERVER['SERVER_PORT'] = '9999'; // Setup
$_SERVER['HTTP_HOST'] = 'some.crazy.server.5.name:8088'; // Port is optional there
$_SERVER['REQUEST_URI'] = '/150/tail/single/normal?get=param';

echo getCurrentUrl();
// http://some.crazy.server.5.name:9999/150/tail/single/normal?get=param

echo getCurrentUrl(false);
// http://some.crazy.server.5.name:9999/

---

I've made this function to handle the URL:

 <?php
     function curPageURL()
     {
         $pageURL = 'http';
         if ($_SERVER["HTTPS"] == "on") {$pageURL .= "s";}
         $pageURL .= "://";
         if ($_SERVER["SERVER_PORT"] != "80") {
             $pageURL .=
             $_SERVER["SERVER_NAME"].":".$_SERVER["SERVER_PORT"].$_SERVER["REQUEST_URI"];
         }
         else {
             $pageURL .= $_SERVER["SERVER_NAME"].$_SERVER["REQUEST_URI"];
         }
         return $pageURL;
     }
 ?>

---

This is quite easy to do with your Apache environment variables. This only works with Apache 2, which I assume you are using.

Simply use the following PHP code:

<?php
    $request_url = apache_getenv("HTTP_HOST") . apache_getenv("REQUEST_URI");
    echo $request_url;
?>

---

Use this one-liner to find the parent folder URL (if you have no access to http_build_url() that comes along with pecl_http):

$url = (isset($_SERVER['HTTPS']) ? 'https://' : 'http://').$_SERVER['SERVER_NAME'].str_replace($_SERVER['DOCUMENT_ROOT'], '', dirname(dirname(__FILE__)));

---

This is the solution for your problem:

//Fetch page URL by this

$url = $_SERVER['REQUEST_URI'];
echo "$url<br />";

//It will print
//fetch host by this

$host=$_SERVER['HTTP_HOST'];
echo "$host<br />";

//You can fetch the full URL by this

$fullurl = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
echo $fullurl;

---

Try this:

print_r($_SERVER);

$_SERVER is an array containing information such as headers, paths, and script locations. The entries in this array are created by the web server. There is no guarantee that every web server will provide any of these; servers may omit some, or provide others not listed here. That said, a large number of these variables are accounted for in the » CGI/1.1 specification, so you should be able to expect those.

$HTTP_SERVER_VARS contains the same initial information, but is not a superglobal. (Note that $HTTP_SERVER_VARS and $_SERVER are different variables and that PHP handles them as such)

---

You can use http_build_url with no arguments to get the full URL of the current page:

$url = http_build_url();

---

I've made this class to handle my URI's

<?php
/** -------------------------------------------------------------------------------------------------------------------
 * URI CLASS
 * URI management class
 *
 * @author Sandu Liviu Catalin
 * @email slc(dot)universe(at)gmail(dot)com
 * @license Public Domain
**/
abstract class _URI
{
    /** ---------------------------------------------------------------------------------------------------------------
     *  - BASE PARAMETERS
     * $_Script_Hidden - Hide the script name from the returned URI
     * $_Public_Path - Location where public resources are stored
     * $_Public_Relative - Return the relative path version of public location
     * $_Public_Skin - Is the skin directory located in the public directory
     * $_Skin_Path - Location where skins are stored
     * $_Skin_Relative - Return the relative path version of skin location
     * $_Skin_Default - Use this as the default system skin
     * $_Fallback_Base - Use this base URL if you can't extract the current URL
     * $_Fallback_Scheme - Use this scheme if you can't find it automatically
     * $_Fallback_User - Use this user name if you can't find it automatically
     * $_Fallback_Passwd - Use this password if you can't find it automatically
     * $_Fallback_Host - Use this host if you can't find it automatically
     * $_Fallback_Port - Use this port number if you can't find it automatically
     * $_Fallback_Script - Use this script name if you can't find it automatically
     * $_Separator_Scheme - Use this to separate the scheme from the rest of the url
     * $_Separator_Credentials - Use this to separate the user name from the password
     * $_Separator_Auth - Use this to separate the user name and password from host
     * $_Separator_Port - Use this to separate the port number from host
     * $_Separator_Query - Use this to separate the query data from base URL
     * $_Separator_Fragment - Use this to separate the fragment data from query data
    */
    protected static $_Script_Hidden;
    protected static $_Public_Path;
    protected static $_Public_Relative;
    protected static $_Public_Skin;
    protected static $_Skin_Path;
    protected static $_Skin_Relative;
    protected static $_Skin_Default;
    protected static $_Fallback_Base;
    protected static $_Fallback_Scheme;
    protected static $_Fallback_User;
    protected static $_Fallback_Passwd;
    protected static $_Fallback_Host;
    protected static $_Fallback_Port;
    protected static $_Fallback_Script;
    protected static $_Separator_Scheme;
    protected static $_Separator_Credentials;
    protected static $_Separator_Auth;
    protected static $_Separator_Port;
    protected static $_Separator_Query;
    protected static $_Separator_Fragment;

    /** ----------------------------------------------------------------------------------------------------------------
     * CACHED BASES
     * Precompiled common URLs for quick retrieval
    */
    protected static $Base_Host;
    protected static $Base_App;
    protected static $Base_Script;
    protected static $Base_Current;
    protected static $Base_Public;
    protected static $Base_Skin;

    /** ----------------------------------------------------------------------------------------------------------------
     * DATA CONTAINERS
     * Raw URI segments saved from extracted data
    */
    protected static $__Segments = array(
        'SCHEME' => '',
        'USER' => '',
        'PASSWD' => '',
        'HOST' => '',
        'PORT' => '',
        'PATH' => '',
        'SCRIPT' => '',
        'INFO' => '',
        'QUERY' => '',
    );

    /** ----------------------------------------------------------------------------------------------------------------
     * PARSER KEYWORDS
     * URI data asigned to specific keywords.
    */
    protected static $__Parsers;

    /** ----------------------------------------------------------------------------------------------------------------
     * CLASS INITIALIZER
     * Initialize the class
     *
     * @access public
     * @param $Params [array] - An associative array of supported parrameters
     * @return void
    */
    public static function __Init($Params=array())
    {
        // Configure the class
        self::$_Script_Hidden = (isset($Params['Script_Hidden'])) ? $Params['Script_Hidden'] : FALSE;
        self::$_Public_Path = (isset($Params['Public_Path'])) ? $Params['Public_Path'] : 'public';
        self::$_Public_Relative = (isset($Params['Public_Relative'])) ? $Params['Public_Relative'] : TRUE;
        self::$_Public_Skin = (isset($Params['Public_Skin'])) ? $Params['Public_Skin'] : TRUE;
        self::$_Skin_Path = (isset($Params['Skin_Path'])) ? $Params['Skin_Path'] : 'themes';
        self::$_Skin_Relative = (isset($Params['Skin_Relative'])) ? $Params['Skin_Relative'] : TRUE;
        self::$_Skin_Default = (isset($Params['Skin_Default'])) ? $Params['Skin_Default'] : 'default';
        self::$_Fallback_Base = (isset($Params['Fallback_Base'])) ? $Params['Fallback_Base'] : '127.0.0.1';
        self::$_Fallback_Scheme = (isset($Params['Fallback_Scheme'])) ? $Params['Fallback_Scheme'] : 'http';
        self::$_Fallback_User = (isset($Params['Fallback_User'])) ? $Params['Fallback_User'] : '';
        self::$_Fallback_Passwd = (isset($Params['Fallback_Passwd'])) ? $Params['Fallback_Passwd'] : '';
        self::$_Fallback_Host = (isset($Params['Fallback_Host'])) ? $Params['Fallback_Host'] : '127.0.0.1';
        self::$_Fallback_Port = (isset($Params['Fallback_Port'])) ? $Params['Fallback_Port'] : '';
        self::$_Fallback_Script = (isset($Params['Fallback_Script'])) ? $Params['Fallback_Script'] : 'index.php';
        self::$_Separator_Scheme = (isset($Params['Separator_Scheme'])) ? $Params['Separator_Scheme'] : '://';
        self::$_Separator_Credentials = (isset($Params['Separator_Credentials'])) ? $Params['Separator_Credentials'] : ':';
        self::$_Separator_Auth = (isset($Params['Separator_Auth'])) ? $Params['Separator_Auth'] : '@';
        self::$_Separator_Port = (isset($Params['Separator_Port'])) ? $Params['Separator_Port'] : ':';
        self::$_Separator_Query = (isset($Params['Separator_Query'])) ? $Params['Separator_Query'] : '?';
        self::$_Separator_Fragment = (isset($Params['Separator_Fragment'])) ? $Params['Separator_Fragment'] : '#';
        // Do some clean up of the configurations
        self::$_Public_Path = implode('/', explode('/', str_replace(array('/', '\\'), '/', self::$_Public_Path)));
        self::$_Skin_Path = implode('/', explode('/', str_replace(array('/', '\\'), '/', self::$_Skin_Path)));
        // Extract the URL information
        self::Extract();
        // Precompile common bases
        self::$Base_Host = self::Compile('HOST');
        self::$Base_App = self::Compile('PATH');
        self::$Base_Script = self::$Base_App.(self::$_Script_Hidden ? '' : '/'.self::$__Segments['SCRIPT']);
        self::$Base_Current = self::$Base_Script.(empty(self::$__Segments['INFO']) ? '' : '/'.self::$__Segments['INFO']);
        self::$Base_Public = self::$_Public_Relative ? self::$_Public_Path : self::$Base_App.'/'.self::$_Public_Path;
        self::$Base_Skin = self::$_Skin_Relative ? self::$_Skin_Path : self::$Base_Public.'/'.self::$_Skin_Path;
        self::$Base_Skin .= '/'.self::$_Skin_Default;
        // Setup the parsers
        self::$__Parsers['SR_Key'][] = '%HostBase%';
        self::$__Parsers['SR_Data'][] =& self::$Base_Host;
        self::$__Parsers['SR_Key'][] = '%AppBase%';
        self::$__Parsers['SR_Data'][] =& self::$Base_App;
        self::$__Parsers['SR_Key'][] = '%ScriptBase%';
        self::$__Parsers['SR_Data'][] =& self::$Base_Script;
        self::$__Parsers['SR_Key'][] = '%CurrentBase%';
        self::$__Parsers['SR_Data'][] =& self::$Base_Current;
        self::$__Parsers['SR_Key'][] = '%PublicBase%';
        self::$__Parsers['SR_Data'][] =& self::$Base_Public;
        self::$__Parsers['SR_Key'][] = '%SkinBase%';
        self::$__Parsers['SR_Data'][] =& self::$Base_Skin;
        self::$__Parsers['SR_Data'][] =& self::$__Segments['SCHEME'];
        self::$__Parsers['SR_Key'][] = '%UserSegment%';
        self::$__Parsers['SR_Data'][] =& self::$__Segments['USER'];
        self::$__Parsers['SR_Key'][] = '%PasswdSegment%';
        self::$__Parsers['SR_Data'][] =& self::$__Segments['PASSWD'];
        self::$__Parsers['SR_Key'][] = '%HostSegment%';
        self::$__Parsers['SR_Data'][] =& self::$__Segments['HOST'];
        self::$__Parsers['SR_Key'][] = '%PortSegment%';
        self::$__Parsers['SR_Data'][] =& self::$__Segments['PORT'];
        self::$__Parsers['SR_Key'][] = '%PathSegment%';
        self::$__Parsers['SR_Data'][] =& self::$__Segments['PATH'];
        self::$__Parsers['SR_Key'][] = '%ScriptSegment%';
        self::$__Parsers['SR_Data'][] =& self::$__Segments['SCRIPT'];
        self::$__Parsers['SR_Key'][] = '%InfoSegment%';
        self::$__Parsers['SR_Data'][] =& self::$__Segments['INFO'];
        self::$__Parsers['SR_Key'][] = '%QuerySegment%';
        self::$__Parsers['SR_Data'][] =& self::$__Segments['QUERY'];
        self::$__Parsers['SR_Key'][] = '%PublicPath%';
        self::$__Parsers['SR_Data'][] =& self::$_Public_Path;
        self::$__Parsers['SR_Key'][] = '%SkinPath%';
        self::$__Parsers['SR_Data'][] =& self::$_Skin_Path;
        self::$__Parsers['SR_Key'][] = '%DefaultSkin%';
        self::$__Parsers['SR_Data'][] =& self::$_Skin_Default;
        // Everything OK so far
    }

    /** ----------------------------------------------------------------------------------------------------------------
     * URI EXTRACTOR
     * Try every posibility to obtain all the segments of the current URL
     *
     * @access public
     * @return array
    */
    public static function Extract()
    {
        // No point in executing twice to get the same result
        if (!empty(self::$__Segments['HOST'])) return self::$__Segments;
        // Let's try to have a falback for most basic data
        $Script_URI = (isset($_SERVER['SCRIPT_URI'])) ? parse_url($_SERVER['SCRIPT_URI']) : array();
        if (empty($Script_URI)) {
            $Script_URI = parse_url(self::$_Fallback_Base);
        }
        // Try ever possibility to obtain the data that surounds the script name
        if (isset($_SERVER['PHP_SELF'])) {
            $Script_Path = $_SERVER['PHP_SELF'];
        } elseif (isset($_SERVER['REQUEST_URI'])) {
            $Script_Path = preg_replace('/\?.*/', '', $_SERVER['REQUEST_URI']);
        } elseif (isset($Script_URI['path'])) {
            $Script_Path = $Script_URI['path'];
        } elseif (isset($_SERVER['SCRIPT_NAME'])) {
            $Script_Path = isset($_SERVER['SCRIPT_NAME']).(isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : '');
        } elseif (isset($_SERVER['DOCUMENT_ROOT']) && isset($_SERVER['SCRIPT_FILENAME'])) {
            $Script_Path = substr($_SERVER['SCRIPT_FILENAME'], strlen($_SERVER['DOCUMENT_ROOT']),
                                    (strlen($_SERVER['SCRIPT_FILENAME'])-strlen($_SERVER['DOCUMENT_ROOT'])));
            $Script_Path .= (isset($_SERVER['PATH_INFO']) ? $_SERVER['PATH_INFO'] : '');
        } else {
            $Script_Path = '';
        }
        // Explode the previously extracted data
        if (strlen($Script_Path) > 0) {
            $Script_Path = preg_split('/[\/]/', $Script_Path, -1, PREG_SPLIT_NO_EMPTY);
        } else {
            $Script_Path = array();
        }
        // Try to obtain the name of the currently executed script
        if (isset($_SERVER['SCRIPT_FILENAME'])) {
            $Script_Name = basename($_SERVER['SCRIPT_FILENAME']);
        } elseif (isset($_SERVER['SCRIPT_NAME'])) {
            $Script_Name = basename($_SERVER['SCRIPT_NAME']);
        } else {
            $Script_Name = self::$_Fallback_Script;
        }
        // Try to find the name of the script in the script path
        $Script_Split = (is_string($Script_Name)) ? array_search($Script_Name, $Script_Path, TRUE) : NULL;
        // Try to obtain the request scheme
        if (isset($_SERVER['REQUEST_SCHEME'])) {
            self::$__Segments['SCHEME'] = $_SERVER['REQUEST_SCHEME'];
        } elseif (isset($_SERVER['SERVER_PROTOCOL'])) {
            self::$__Segments['SCHEME'] = strtolower($_SERVER['SERVER_PROTOCOL']);
            self::$__Segments['SCHEME'] = substr(self::$__Segments['SCHEME'], 0, strpos(self::$__Segments['SCHEME'], '/'));
            self::$__Segments['SCHEME'] .= (isset($_SERVER["HTTPS"]) && $_SERVER["HTTPS"] == 'on') ? 's' : '';
        } elseif (isset($Script_URI['scheme'])) {
            self::$__Segments['SCHEME'] = $Script_URI['scheme'];
        } else {
            self::$__Segments['SCHEME'] = self::$_Fallback_Scheme;
        }
        // Try to obtain the user name (if one was used)
        if (isset($_SERVER['PHP_AUTH_USER'])) {
            self::$__Segments['USER'] = $_SERVER['PHP_AUTH_USER'];
        } elseif (isset($Script_URI['user'])) {
            self::$__Segments['USER'] = $Script_URI['user'];
        } else {
            self::$__Segments['USER'] = self::$_Fallback_User;
        }
        // Try to obtain the user password (if one was used)
        if (isset($_SERVER['PHP_AUTH_PW'])) {
            self::$__Segments['PASSWD'] = $_SERVER['PHP_AUTH_PW'];
        } elseif (isset($Script_URI['pass'])) {
            self::$__Segments['PASSWD'] = $Script_URI['pass'];
        } else {
            self::$__Segments['PASSWD'] = self::$_Fallback_Passwd;
        }
        // Try to obtai the host name
        if (isset($_SERVER['SERVER_NAME'])) {
            self::$__Segments['HOST'] = $_SERVER['SERVER_NAME'];
        } elseif (isset($_SERVER['HTTP_HOST'])) {
            self::$__Segments['HOST'] = $_SERVER['HTTP_HOST'];
        } elseif (isset($Script_URI['host'])) {
            self::$__Segments['HOST'] = $Script_URI['host'];
        } else {
            self::$__Segments['HOST'] = self::$_Fallback_Host;
        }
        // Try to obtain the port number (if one was used)
        if (isset($Script_URI['port'])) {
            self::$__Segments['PORT'] = $Script_URI['port'];
        } else {
            self::$__Segments['PORT'] = self::$_Fallback_Port;
        }
        // Try to obtain the path to the script
        if (is_numeric($Script_Split)) {
            self::$__Segments['PATH'] = implode('/', array_slice($Script_Path, 0, $Script_Split, TRUE));
        } else {
            self::$__Segments['PATH'] = '';
        }
        // Try to obtain the Script name
        if (is_string($Script_Name)) {
            self::$__Segments['SCRIPT'] = $Script_Name;
        } else {
            self::$__Segments['SCRIPT'] = '';
        }
        // Try to obtain any passed info
        if (isset($_SERVER['PATH_INFO'])) {
            self::$__Segments['INFO'] = implode('/', preg_split('/[\/]/', $_SERVER['PATH_INFO'], -1, PREG_SPLIT_NO_EMPTY));
        } elseif (is_numeric($Script_Split)) {
            self::$__Segments['INFO'] = implode('/', array_slice($Script_Path, $Script_Split+1));
        } else {
            self::$__Segments['INFO'] = '';
        }
        // -----Pending Feature: Try to also extract the query string

        // Return the extracted URI segments
        return self::$__Segments;

    }

    /** ----------------------------------------------------------------------------------------------------------------
     * URI COMPILER
     * Compile raw URI segments into a usable URL
     *
     * @access public
     * @param $Until [string] - The name of the segment where compilation should stop and return
     * @return string
    */
    public static function Compile($Until=NULL)
    {
        $URI= '';
        $Until = (is_string($Until)) ? strtoupper($Until) : $Until;
        if ($Until === 'SCHEME') {
            return $URI .= (self::$__Segments['SCHEME'] !== '') ? self::$__Segments['SCHEME'].self::$_Separator_Scheme : '';
        } else {
            $URI .= (self::$__Segments['SCHEME'] !== '') ? self::$__Segments['SCHEME'].self::$_Separator_Scheme : '';
        }
        if ($Until === 'USER') {
            return $URI .= (self::$__Segments['USER'] !== '') ? self::$__Segments['USER'].self::$_Separator_Credentials : '';
        } else {
            $URI .= (self::$__Segments['USER'] !== '') ? self::$__Segments['USER'] : '';
        }
        $URI .= (self::$__Segments['USER'] !== '' || self::$__Segments['PASSWD'] !== '') ? self::$_Separator_Credentials : '';
        if ($Until === 'PASSWD') {
            return $URI .= (self::$__Segments['PASSWD'] !== '') ? self::$__Segments['PASSWD'].self::$_Separator_Auth : '';
        } else {
            $URI .= (self::$__Segments['PASSWD'] !== '') ? self::$__Segments['PASSWD'] : '';
        }
        $URI .= (self::$__Segments['USER'] !== '' || self::$__Segments['PASSWD'] !== '') ? self::$_Separator_Auth : '';
        if ($Until === 'HOST') {
            return $URI .= (self::$__Segments['HOST'] !== '') ? self::$__Segments['HOST'] : '';
        } else {
            $URI .= (self::$__Segments['HOST'] !== '') ? self::$__Segments['HOST'] : '';
        }
        if ($Until === 'PORT') {
            return $URI .= (self::$__Segments['PORT'] !== '') ? self::$_Separator_Port.self::$__Segments['PORT'] : '';
        } else {
            $URI .= (self::$__Segments['PORT'] !== '') ? self::$_Separator_Port.self::$__Segments['PORT'] : '';
        }
        if ($Until === 'PATH') {
            return $URI .= (self::$__Segments['PATH'] !== '') ? '/'.self::$__Segments['PATH'] : '';
        } else {
            $URI .= (self::$__Segments['PATH'] !== '') ? '/'.self::$__Segments['PATH'] : '';
        }
        if ($Until === 'SCRIPT') {
            return $URI .= (self::$__Segments['SCRIPT'] !== '') ? '/'.self::$__Segments['SCRIPT'] : '';
        } else {
            $URI .= (self::$__Segments['SCRIPT'] !== '') ? '/'.self::$__Segments['SCRIPT'] : '';
        }
        if ($Until === 'INFO') {
            return $URI .= (self::$__Segments['INFO'] !== '') ? '/'.self::$__Segments['INFO'] : '';
        } else {
            $URI .= (self::$__Segments['INFO'] !== '') ? '/'.self::$__Segments['INFO'] : '';
        }
        return $URI;
    }

    /** ----------------------------------------------------------------------------------------------------------------
     * SEGMENT RETRIEVER
     * Return a specific URI segment
     *
     * @access public
     * @param $Name [string] - The name of the segment you want
     * @return string (on success) bool (on failure)
    */
    public static function Segment($Name)
    {
        if (isset(self::$__Segments[$Name])) {
            return self::$__Segments[$Name];
        } return FALSE;
    }

    /** ----------------------------------------------------------------------------------------------------------------
     * BASE RETRIEVER
     * Return a specific precompiled base
     *
     * @access public
     * @param $Name [string] - The name of the base you want
     * @return mixed (on success) boolean (on failure)
    */
    public static function Base($Name)
    {
        switch ($Name) {
            case 'Host':
            case 'Domain':
                return self::$Base_Host;
            break;
            case 'App':
            case 'Base':
                return self::$Base_App;
            break;
            case 'Script':
            case 'Index':
                return self::$Base_Script;
            break;
            case 'Current':
            case 'This':
                return self::$Base_Current;
            break;
            case 'Public':
            case 'Web':
                return self::$Base_Public;
            break;
            case 'Skin':
            case 'Theme':
                return self::$Base_Skin;
            break;
            case 'All':
                return array(
                    'Host'=>self::$Base_Host,
                    'App'=>self::$Base_App,
                    'Script'=>self::$Base_Script,
                    'Current'=>self::$Base_Current,
                    'Public'=>self::$Base_Public,
                    'Skin'=>self::$Base_Skin,
                );
            break;
        } return FALSE;
    }

    /** ----------------------------------------------------------------------------------------------------------------
     * STRING PARSER
     * Replace known keywords in the specified string with current URI data
     *
     * @access public
     * @param $String [string] - A string that you want to parse
     * @return void
    */
    public static function Parse($String)
    {
        if (is_string($String)) {
            return str_replace(self::$__Parsers['SR_Key'], self::$__Parsers['SR_Data'], $String);
        } elseif (is_array($String)) {
            foreach ($String as $K => $V) {
                $Parsed[$K] = self::$replace($V);
            } return $Parsed;
        } return FALSE;
    }
}
if (isset($_URI_Params)) {
    _URI::__Init($_URI_Params);
} else {
    _URI::__Init();
} 

Of course you have to adapt it to your needs and system !?!

<?php
// Change a few parameters before loading the class.
$_URI_Params = array(
    'Public_Relative' => FALSE,
    'Skin_Relative' => FALSE,
    'Skin_Default' => 'classic',
    // etc.
);
// Get the URI class
require('uri.php');
// Output all extracted URI segments
echo '<pre>';
var_dump(_URI::Extract());
echo '</pre>';
// Output extracted segments individually
echo 'Scheme: '._URI::Segment('SCHEME').'<br/>';
echo 'User: '._URI::Segment('USER').'<br/>';
echo 'Password: '._URI::Segment('PASSWD').'<br/>';
echo 'Host: '._URI::Segment('HOST').'<br/>';
echo 'Port: '._URI::Segment('PORT').'<br/>';
echo 'Path: '._URI::Segment('PATH').'<br/>';
echo 'Script: '._URI::Segment('SCRIPT').'<br/>';
echo 'Info: '._URI::Segment('INFO').'<br/>';
// Compile extracted segments into a usable URL
echo '<br/>';
echo 'Full Compiled URI: '._URI::Compile().'<br/>';
echo '<br/>';
// Output precompiled common bases for a faster result and better performance
echo 'Host Base: '._URI::Base('Host').'<br/>';
echo 'Application Base: '._URI::Base('App').'<br/>';
echo 'Running Script: '._URI::Base('Script').'<br/>';
echo 'Current URI Base: '._URI::Base('Current').'<br/>';
echo 'Public Folder Base: '._URI::Base('Public').'<br/>';
echo 'Skin Folder Base: '._URI::Base('Skin').'<br/>';
// Get all the precompiled bases in an associative array
echo '<pre>';
var_dump(_URI::Base('All'));
echo '</pre>';
// Parse an example string and replace known keys with actual URI data.
echo _URI::Parse('This is my current domain: %HostBase%
And the current application is here: %AppBase%
I load my skins form: %SkinBase%
etc.
'); 

It still needs to be perfected but it's a god solution for a centralized URI system :D

---

    public static function getCurrentUrl($withQuery = true)
    {
        $protocol = (!empty($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off')
        or (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && strtolower($_SERVER['HTTP_X_FORWARDED_PROTO']) === 'https')
        or (!empty($_SERVER['HTTP_FRONT_END_HTTPS']) && strtolower($_SERVER['HTTP_FRONT_END_HTTPS']) !== 'off')
        or (isset($_SERVER['SERVER_PORT']) && intval($_SERVER['SERVER_PORT']) === 443) ? 'https' : 'http';

        $uri = $protocol . '://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];

        return $withQuery ? $uri : str_replace('?' . $_SERVER['QUERY_STRING'], '', $uri);
    }

---

I used this statement.

$base = "http://$_SERVER[SERVER_NAME]:$_SERVER[SERVER_PORT]$my_web_base_path";
$url = $base . "/" . dirname(dirname(__FILE__));

I hope this will help you.

---

Here is the basis of a more secure version of the accepted answer, using PHP's filter_input function, which also makes up for the potential lack of $_SERVER['REQUEST_URI']:

$protocol_https = filter_input(INPUT_SERVER, 'HTTPS', FILTER_SANITIZE_STRING);
$host = filter_input(INPUT_SERVER, 'HTTP_HOST', FILTER_SANITIZE_URL);
$request_uri = filter_input(INPUT_SERVER, 'REQUEST_URI', FILTER_SANITIZE_URL);
if(strlen($request_uri) == 0)
{
    $request_uri = filter_input(INPUT_SERVER, 'SCRIPT_NAME', FILTER_SANITIZE_URL);
    $query_string = filter_input(INPUT_SERVER, 'QUERY_STRING', FILTER_SANITIZE_URL);
    if($query_string)
    {
        $request_uri .= '?' . $query_string;
    }
}
$full_url = ($protocol_https ? 'https' : 'http') . '://' . $host . $request_uri;

You could use some different filters to tweak it to your liking.

---

I have used the below code, and it is working fine for me, for both cases, HTTP and HTTPS.

function curPageURL() {
  if(isset($_SERVER["HTTPS"]) && !empty($_SERVER["HTTPS"]) && ($_SERVER["HTTPS"] != 'on' )) {
        $url = 'https://'.$_SERVER["SERVER_NAME"];//https url
  }  else {
    $url =  'http://'.$_SERVER["SERVER_NAME"];//http url
  }
  if(( $_SERVER["SERVER_PORT"] != 80 )) {
     $url .= $_SERVER["SERVER_PORT"];
  }
  $url .= $_SERVER["REQUEST_URI"];
  return $url;
}

echo curPageURL();

Demo

---

$base_dir = __DIR__; // Absolute path to your installation, ex: /var/www/mywebsite
$doc_root = preg_replace("!{$_SERVER['SCRIPT_NAME']}$!", '', $_SERVER['SCRIPT_FILENAME']); # ex: /var/www
$base_url = preg_replace("!^{$doc_root}!", '', $base_dir); # ex: '' or '/mywebsite'
$base_url = str_replace('\\', '/', $base_url);//On Windows
$base_url = str_replace($doc_root, '', $base_url);//On Windows
$protocol = empty($_SERVER['HTTPS']) ? 'http' : 'https';
$port = $_SERVER['SERVER_PORT'];
$disp_port = ($protocol == 'http' && $port == 80 || $protocol == 'https' && $port == 443) ? '' : ":$port";
$domain = $_SERVER['SERVER_NAME'];
$full_url = "$protocol://{$domain}{$disp_port}{$base_url}"; # Ex: 'http://example.com', 'https://example.com/mywebsite', etc. 

source: http://blog.lavoie.sl/2013/02/php-document-root-path-and-url-detection.html

---

Very simple use:

function current_url() {
    $current_url  = ( $_SERVER["HTTPS"] != 'on' ) ? 'http://'.$_SERVER["SERVER_NAME"] :  'https://'.$_SERVER["SERVER_NAME"];
    $current_url .= ( $_SERVER["SERVER_PORT"] != 80 ) ? ":".$_SERVER["SERVER_PORT"] : "";
    $current_url .= $_SERVER["REQUEST_URI"];

    return $current_url;
}

---

This works for both HTTP and HTTPS.

echo 'http' . (($_SERVER['HTTPS'] == 'on') ? 's' : '') . '://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];

Output something like this.

https://example.com/user.php?token=3f0d9sickc0flmg8hnsngk5u07&access_level=application

---

You can make use of HTTP_ORIGIN as illustrated in the snippet below:

if ( ! array_key_exists( 'HTTP_ORIGIN', $_SERVER ) ) {
    $this->referer = $_SERVER['SERVER_NAME'];
} else {
    $this->referer = $_SERVER['HTTP_ORIGIN'];
}

---

I think this method is good..try it

if($_SERVER['HTTP_HOST'] == "localhost"){
    define('SITEURL', 'http://' . $_SERVER['HTTP_HOST']);
    define('SITEPATH', $_SERVER['DOCUMENT_ROOT']);
    define('CSS', $_SERVER['DOCUMENT_ROOT'] . '/css/');
    define('IMAGES', $_SERVER['DOCUMENT_ROOT'] . '/images/');
}
else{
    define('SITEURL', 'http://' . $_SERVER['HTTP_HOST']);
    define('SITEPATH', $_SERVER['DOCUMENT_ROOT']);
    define('TEMPLATE', $_SERVER['DOCUMENT_ROOT'] . '/incs/template/');
    define('CSS', $_SERVER['DOCUMENT_ROOT'] . '/css/');
    define('IMAGES', $_SERVER['DOCUMENT_ROOT'] . '/images/');
}

---

$page_url = (isset($_SERVER['HTTPS']) ? "https" : "http") . "://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

For more: How to get the full URL of a page using PHP

---