Composer: The requested PHP extension ext-intl * is missing from your system

I encountered this using it in Mac, resolved it by using --ignore-platform-reqs option.

composer install --ignore-platform-reqs

PHP uses a different php.ini for command line php than for the web/apache php. So you see the intl extension in phpinfo() in the browser, but if you run php -m in the command line you might see that the list of extensions there does not include intl.

You can check using php -i on top of the output it should tell you where the ini file is loaded from. Make sure you enable the intl extension in that ini file and you should be good to go.

For php.ini 5.6 version (check version using php -v)

;extension=php_intl.dll 
; remove semicolon
extension=php_intl.dll

For php.ini 7.* version

;extension=intl
; remove semicolon
extension=intl

In linux (Debian Jessie for example):

apt-get install php7.0-intl

will make the job to you due will create a simbolic link to it.

To enable intl extension follow the instructions below.

You need enable extension by uncommenting the following line extension=php_intl.dll in the C:\xampp\php\php.ini file. Once you uncomment the extension=php_intl.dll, then you must restart apache server using XAMPP control panel.

//about line 998
;extension=php_intl.dll 
change as
extension=php_intl.dll

(Note: php.ini file mostly in the following directory C:\xampp\php)

Restart xampp

I have solved this problem by adding --ignore-platform-reqs command with composer install in ubuntu.

composer install --ignore-platform-reqs

just remove them

"ext-intl" : "*"

from your composer.json file.

Because sometimes for some helper functions, the IDE complains that the extension is missing from the composer.json file. Immediately press Alt+Enter to add it to the composer. But that doesn't mean that composer will count them in. The composer will complain next time while doing some operations. So that, we should not blindly type Alt+Enter rather than installing them manually in composer by doing composer install <package-name>.

As I think you have entered it manually, you should remove it, then install it in proper procedure composer install <package-name>

Or else you can run composer update to count that added dependencies in.

This is bit old question but I had faced same problem on linux base server while installing magento 2.

When I am firing composer update or composer install command from my magento root dir. Its was firing below error.

Problem 1
    - The requested PHP extension ext-intl * is missing from your system. Install or enable PHP's intl extension.
  Problem 2
    - The requested PHP extension ext-mbstring * is missing from your system. Install or enable PHP's mbstring extension.
  Problem 3
    - Installation request for pelago/emogrifier 0.1.1 -> satisfiable by pelago/emogrifier[v0.1.1].
    - pelago/emogrifier v0.1.1 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system.
   ...

Then, I searched for the available intl & intl extensions, using below commands.

yum list php*intl
yum install php-intl.x86_64  

yum list php*mbstring
yum install php-mbstring.x86_64

And it fixed the issue.

If You have got this error while running composer install command, don't worry. Steps to be followed and requirements:

Step1: Go to server folder such as xampp(or) wampp etc.

Step2: open php folder inside that and go to ext folder.

Step3: If you find a file named as php_intl.dll no problem.

Just go to php.ini file and uncomment the line

From:

;extension=php_intl.dll

To:

extension=php_intl.dll

Step4: restart xampp, thats it

Note: If you don't find any of the file named as php_intl.dll, then you need to upgrade the PHP version.

(with xampp server)open php.ini in ".\xampp\php"

change ;extension=intl to extension=intl

For php.ini 5.6 version (check version using php -v)

;extension=php_intl.dll ; remove semicolon and keep like this extension=php_intl.dll

For php.ini 7.* version

;extension=intl ; remove semicolon and keep like this extension=intl

Note - After That Make Sure to Restart Your Xampp,Wamp Server in you Local Machine.

I have faced the same issue on my server. And it is mainly happened due to miss-match of php version between server version and your system version. I am using Nginx and checked on all my project configuration files, it uses php8.0 but on my terminal it shows php.8.1. Actually my application needs php8.0. The following steps resolved my issue.

To see all my running php versions

sudo update-alternatives --config php 

https://i.stack.imgur.com/BLyIV.png

Selecting php8.0 for my application. Run the command to see Nginx scripts are ok

sudo nginx -t

Then reload the Nginx

sudo systemctl reload nginx

Finally go to your project directory and update or install your composer

composer update

It has been resolved my issue, I expect same will resolve yours.

Just uncomment this line (to find it, simply search this line in editor):

;extension=php_sockets.dll

(Remove semicolon to uncomment)

For me, no need to restart XAMPP (in your case, WAMP). But if didn't work, restart it.

In latest XAMPP version; You need to find only intl(Line no 912)in php.ini file. Change ;extension=intl To extension=intl

In my case, I am using ubuntu, run this command, it will be solved if your system is also ubuntu.

sudo apt-get install php-intl