Php check if extension is enabled

How to Check If a PHP Extension is Installed via Command Line

Learn how to check if a PHP extension is installed or loaded via command line and troubleshoot issues with basic extension management practices.

PHP extensions are essential components for web development. They add functionality to the core PHP language and allow developers to use additional features that are not included in the base PHP installation. It’s important to know how to check if an extension is installed or loaded to troubleshoot issues. In this guide, we will walk through how to check installed PHP extensions via command line, see the loaded extensions and basic PHP extension management best practices.

Checking Installed PHP Extensions via Command Line

To check Installed PHP Extensions via command line, make sure php5-cli is installed and run the following command:

This will return a list of all installed extensions. If the php5-cli package is not installed, you can install it on Ubuntu using

sudo apt-get install php5-cli 

You can also specify a PHP version by adding it to the command:

If you want to check if a specific extension is installed, use

Seeing the Loaded Extensions

To see the loaded extensions, use the phpinfo() function. Create a text file with the following content:

Save it as “version.php” and open it in a web browser. This will display a lot of information about your PHP installation, including a list of all the loaded extensions. You can also use the -m switch with the CLI version of PHP to see the loaded extensions:

PHP Extension Management

PHP extensions can be installed by compiling and installing from source or using a package manager. Best practices for PHP extension management include regularly updating and removing unused extensions.

Compiling and installing from source is a more advanced method and requires knowledge of the build process. Using a package manager, such as apt-get, yum, or Homebrew, simplifies the installation process. To remove an extension, delete the extension file and restart the web server.

Common Issues with PHP Extensions

common issues with php extensions include compatibility problems with different versions of PHP and conflicts with other extensions. Troubleshooting these issues involves checking for conflicting extensions and updating to the latest version of PHP.

Troubleshooting can also involve checking the PHP error log for any related errors. The dl() function can be used to dynamically load a PHP extension at runtime, but it is not recommended due to security risks.

Other PHP code samples that may be helpful for checking if a PHP extension is installed or loaded include the use of the function extension_loaded() and the command php-config —extension-dir

In Php , for instance, php check if extension is installed code sample

Conclusion

Checking if a PHP extension is installed or loaded is an essential skill for web developers. By using the command line and phpinfo() function, you can easily check for installed and loaded extensions. Basic PHP extension management best practices and troubleshooting tips can help avoid common issues and optimize performance.

Frequently Asked Questions — FAQs

What are PHP extensions and why are they important?

PHP extensions are additional features or libraries that can be added to a PHP installation to provide additional functionality for web development. They are important because they can enhance the performance and capabilities of a PHP application.

How do I know if a PHP extension is installed?

You can use the command line and run «php -m» to see a list of all installed extensions. To check if a specific extension is installed, use «php -m | grep «. You can also use the phpinfo() function to see the loaded extensions.

What are the best practices for managing PHP extensions?

Best practices for PHP extension management include regularly updating and removing unused extensions. Extensions can be installed by compiling and installing from source or using a package manager, such as apt-get, yum, or Homebrew.

What are common issues with PHP extensions?

Common issues with PHP extensions include compatibility problems with different versions of PHP and conflicts with other extensions. Troubleshooting these issues involves checking for conflicting extensions and updating to the latest version of PHP.

How can I dynamically load a PHP extension at runtime?

The dl() function can be used to dynamically load a PHP extension at runtime, but it is not recommended due to security risks.

How can I troubleshoot PHP extension issues?

Troubleshooting PHP extension issues involves checking for conflicting extensions, updating to the latest version of PHP, and checking the PHP error log for any related errors.

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How to check which PHP extensions have been enabled/disabled in Ubuntu Linux 12.04 LTS?

to get the list of installed php modules, you will probably find it helpful to get the list of the currently installed php packages in Ubuntu:

sudo dpkg --get-selections | grep -v deinstall | grep php 

This is helpful since Ubuntu makes php modules available via packages.

You can then install the needed modules by selecting from the available Ubuntu php packages, which you can view by running:

sudo apt-cache search php | grep "^php5-" 

Or, for Ubuntu 16.04 and higher:

sudo apt-cache search php | grep "^php7" 

As you have mentioned, there is plenty of information available on the actual installation of the packages that you might require, so I won’t go into detail about that here.

Related: Enabling / disabling installed php modules

It is possible that an installed module has been disabled. In that case, it won’t show up when running php -m , but it will show up in the list of installed Ubuntu packages.

Modules can be enabled/disabled via the php5enmod tool ( phpenmod on later distros) which is part of the php-common package.

Ubuntu 12.04:

Enabled modules are symlinked in /etc/php5/conf.d

Ubuntu 12.04: (with PHP 5.4+)

To enable an installed module:

To disable an installed module:

Ubuntu 16.04 (php7) and higher:

To enable an installed module:

To disable an installed module:

Reload Apache

Remember to reload Apache2 after enabling/disabling:

Solution 2

To check if this extensions are enabled or not, you can create a php file i.e. info.php and write the following code there:

'; echo "XML: ", extension_loaded('xml') ? 'OK' : 'MISSING', '
'; echo "zip: ", extension_loaded('zip') ? 'OK' : 'MISSING', '
'; ?> 

Solution 3

You can view which modules (compiled in) are available via terminal through php -m

Solution 4

Perhaps the easiest way to see which extensions are (compiled and) loaded (not in cli) is to have a server run the following:

PHP cli does not necessarily have the same extensions loaded.

Solution 5

For information on php extensions etc, on site.

1. Create a new file and name it info.php (or some other name.php )
2. Write this code in it:

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How to check PHP Extensions is installed or not?

Suppose you are facing library issues, you get the library functions error then first you need to check the module is loaded or not. It is very easy to confirm the library is installed or not. In this article, I will let you know how can you check the PHP extensions are loaded or not.

How to check extensions loaded or not by PHP?

Using Command Line:

If you using a command line then you can use the below command to get all module lists.

If you want details information, you can use php -i to get phpinfo(); response.

Run below command to check all loaded extensions by PHP:

php -r "print_r(get_loaded_extensions());"

Check specific extensions whether extension is installed or not.

php -r "print_r(get_loaded_extensions('gd'));"

If you want to uninstall all modules and install all again. Use below command with PHP version.

To view all PHP command-line options, run below command.

Using PHP code:

You can show all PHP information by using the below code. You can find the extension name. Do ctrl+f and search the extension name.

To get all loaded extensions, please use below code.

"; print_r(get_loaded_extensions()); echo "
"; ?>
 
 
You can also check any specific extensions whether the extension is installed or not. In the below code, I checked GD Library is installed or not. Thus you can check for other extensions also.
 
 
Thanks for reading, feel free to reach out to me for any comments and suggestions. I hope you found the article helpful and you were able to fix the PHP library issues..
 
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