How do I install soap extension?

For Windows

Find extension=php_soap.dll or extension=soap in php.ini and remove the commenting semicolon at the beginning of the line. Eventually check for soap.ini under the conf.d directory. Restart your server.

For Linux

Ubuntu:

PHP7

Apache

sudo apt-get install php7.0-soap 
sudo systemctl restart apache2

PHP5

sudo apt-get install php-soap
sudo systemctl restart apache2

OpenSuse:

PHP7

Apache

sudo zypper in php7-soap
sudo systemctl restart apache2

Nginx

sudo zypper in php7-soap
sudo systemctl restart nginx

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In ubuntu to install php_soap on PHP7 use below commands. Reference

sudo apt-get install php7.0-soap
sudo systemctl restart apache2.service

For older version of php use below command and restart apache.

apt-get install php-soap

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find this line in php.ini :

;extension=soap

then remove the semicolon ; and restart Apache server

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Please follow the below steps :

 1) Locate php.ini in your apache bin folder, I.e Apache/bin/php.ini
 2) Remove the ; from the beginning of extension=php_soap.dll
 3) Restart your Apache server (by using : 
    # /etc/init.d/apache2 restart OR 
    $ sudo /etc/init.d/apache2 restart OR 
    $ sudo service apache2 restart)
 4) Look up your phpinfo();

 you may check here as well,if this does not solve your issue:  
 https://www.php.net/manual/en/soap.requirements.php

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In Ubuntu with php7.3:

sudo apt install php7.3-soap 
sudo service apache2 restart

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I had the same problem, there was no extension=php_soap.dll in my php.ini But this was because I had copied the php.ini from a old and previous php version (not a good idea). I found the dll in the ext directory so I just could put it myself into the php.ini extension=php_soap.dll After Apache restart all worked with soap :)

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How To for Linux Ubuntu...

sudo apt-get install php7.1-soap 

Check if file php_soap.ao exists on /usr/lib/php/20160303/

ls /usr/lib/php/20160303/ | grep -i soap
soap.so
php_soap.so

sudo vi /etc/php/7.1/cli/php.ini

Change the line :

;extension=php_soap.dll

to

extension=php_soap.so

sudo systemctl restart apache2

CHecking...

php -m | more

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Dreamhost now includes SoapClient in their PHP 5.3 builds. You can switch your version of php in the domain setup section of the dreamhost control panel.

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They dont support it as in in they wont help you or be responsible for you hosing anything, but you can install custom extensions. To do so you need to first set up a local install of php 5, during that process you can compile in extensions you need or you can add them dynamically to the php.ini after the fact.

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For Ubuntu+php 5.6+nginx I used

sudo apt install php5.6-soap
sudo systemctl restart nginx
sudo systemctl restart php5.6-fpm.service

Only after that it started to work.

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