Install PHP modules with your VPS distribution’s package manager, then restart the PHP runtime that actually serves your application. On Debian or Ubuntu, the usual path is sudo apt update followed by sudo apt install php-<module>. On Fedora, RHEL and other DNF-based systems, search with dnf search php and install the matching package. Finally, verify the module in the correct SAPI (CLI, Apache, CGI or PHP-FPM), because a command-line PHP installation and a web application can load different configuration files.
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This guide covers package names, Apache/Nginx and PHP-FPM restarts, version-specific php.ini locations, explicit enablement, diagnosis of “undefined function” errors, and the PECL/phpize fallback for extensions that are not available as normal distribution packages.
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What a PHP module is and why installation can appear to fail
A PHP module (also called an extension) adds functionality that is not part of the smallest PHP runtime. Database drivers, cURL networking, image processing, XML handling and many other features are delivered as loadable extensions. A package manager normally installs the compiled module, its dependencies and the configuration fragment that tells PHP to load it.
Installation has three separate parts:
- Package selection: choose a package compatible with the PHP version installed on the VPS.
- Configuration: ensure the SAPI used by the application reads an ini file that enables the extension.
- Process reload: restart Apache, PHP-FPM or another serving process so it reads the new module.
The most common mistake is checking only the CLI binary with php -m while the website runs under a different PHP-FPM pool or Apache module. Always verify the runtime that serves the application.
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Before you install: identify the distribution, PHP version and SAPI
Identify the Linux distribution
Use the operating system’s release information to determine whether the VPS uses Debian/Ubuntu’s APT tooling or a DNF-based system:
cat /etc/os-releaseDebian and Ubuntu use apt. Fedora, Rocky Linux, AlmaLinux, RHEL and related systems commonly use dnf (older releases may expose a compatible yum command).
Check the installed PHP version and command-line configuration
php -v
php --ini
php -mphp -v identifies the CLI version. php --ini prints the CLI configuration file and the additional ini directory it scans. php -m lists modules loaded by that CLI binary; it does not prove that Apache or PHP-FPM loads the same modules.
Determine the web SAPI
Common deployments are:
- Apache with mod_php: Apache loads PHP directly through its PHP module.
- Apache or Nginx with PHP-FPM: a separate PHP-FPM service executes PHP requests.
- CGI: a CGI PHP binary handles requests.
- CLI: command-line scripts, queue workers and cron jobs use the CLI binary.
For a web request, a temporary diagnostic script containing <?php phpinfo(); displays the web SAPI, loaded configuration file and loaded modules. Place it where the application can reach it, inspect it, and remove it immediately afterward because it reveals server configuration. An application-level diagnostic that calls php_sapi_name() and checks the required function or class is another option.
Install modules on Debian or Ubuntu with APT
Refresh package metadata
sudo apt updateRun this before searching or installing so APT has current repository metadata. If the command reports repository or signature errors, resolve those first; an extension package cannot be selected reliably from stale or broken metadata.
Search for the package name
apt search php-
apt-cache search phpPackage names are not always identical to the PHP function or feature name. Search results also show which packages are available for the distribution release and, in some repositories, for a particular PHP version.
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Install one or more packages in a single command when they are available in the repositories:
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sudo apt install php-mysql php-curlTypical Debian/Ubuntu package names include:
| Purpose | Common package | Notes |
|---|---|---|
| MySQL and compatible database APIs | php-mysql |
Provides the PHP MySQL drivers supplied by the distribution. |
| cURL networking | php-curl |
Enables cURL functions and related support. |
| PostgreSQL database APIs | php-pgsql |
Use when the application connects to PostgreSQL. |
| Command-line interpreter | php-cli |
Required for PHP scripts run from a shell, cron or a queue worker. |
| CGI support | php-cgi |
Used by CGI-based deployments. |
| Apache integration | libapache2-mod-php |
Used when Apache runs PHP through mod_php. |
Ubuntu’s documented Apache setup uses:
sudo apt install php libapache2-mod-phpThe unversioned names usually select the distribution’s default PHP stream. If your application requires a specific PHP release, confirm that the package candidate matches it instead of assuming that every php-* package targets the same version.
Enable or disable a module explicitly
Debian-family systems provide helper commands for modules that have an enablement file:
sudo phpenmod extension_name
sudo phpdismod extension_nameUse the extension’s configuration name, not necessarily the full APT package name. If the package already installed an enabled fragment, these commands may not be necessary; they are useful when a module was disabled intentionally or when you need to make the state explicit.
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Install modules on Fedora, RHEL and other DNF systems
Search the enabled repositories
sudo dnf search phpThe result depends on the operating-system release, enabled repositories and PHP stream. Select a package that matches the PHP version used by the application rather than simply choosing the first similarly named result.
Install the required package
sudo dnf install php-mysqlnd php-gdphp-mysqlnd supplies the MySQL native driver package used by many DNF-based distributions, while php-gd supplies common image functions. Other extensions follow the same search-and-install pattern, but names can differ from Debian/Ubuntu names. Do not substitute php-mysql automatically on a DNF system without checking the package search results.
DNF installs the main configuration in locations such as /etc/php.ini and extension fragments under /etc/php.d/*.ini. The exact files present depend on the distribution and PHP stream.
Restart the runtime that serves the application
Installing a package does not reload a running PHP process. Restart the service associated with your deployment after changing modules or their ini files.
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Apache on Debian or Ubuntu
sudo systemctl restart apache2Use this when Apache handles PHP through its module or when Apache is the process that must be reloaded for the deployment.
Apache on a DNF-based system
sudo systemctl restart httpdThe DNF documentation uses the httpd service name for Apache.
PHP-FPM behind Apache or Nginx
Restart the PHP-FPM service for the installed PHP version. Service names vary by distribution and version, so first inspect the available units if you are unsure:
systemctl list-units --type=service | grep -i fpmThen restart the matching unit, for example:
sudo systemctl restart php-fpmSome systems use a versioned name such as php8.2-fpm. Restarting Nginx alone does not reload PHP-FPM workers, and restarting PHP-FPM alone does not reload an independently cached web-server configuration; restart the process that owns the PHP runtime you changed.
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Verify CLI PHP
php -m | grep -i module_name
php --iniReplace module_name with the module’s displayed name. The case shown by php -m may differ from the package name.
Verify Apache, CGI or PHP-FPM
Use phpinfo() or an application-level health check through the same URL, worker, queue process or cron context that failed. Confirm all three values:
- The PHP version is the one for which you installed the package.
- The “Loaded Configuration File” belongs to the expected SAPI.
- The module appears in the loaded-modules list and its configuration is enabled.
On Debian-family systems, configuration commonly looks like:
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/etc/php/M.N/cli/php.ini
/etc/php/M.N/$SAPI/conf.d/Here M.N is the PHP major and minor version, and $SAPI can be cli, apache2, cgi or fpm. A module enabled for cli is not automatically enabled for fpm.
Which installation approach should you use?
| Approach | Best use | SAPI and version considerations | Maintenance and restart |
|---|---|---|---|
| Distribution package with APT | Debian or Ubuntu when a suitable package exists. | Choose a package compatible with the installed PHP stream; configuration is separated by version and SAPI. | Dependencies and security updates come from the distribution. Restart Apache or PHP-FPM after installation. |
| Distribution package with DNF | Fedora, RHEL-family and other DNF systems. | Use the package returned by dnf search php for the enabled PHP stream. |
DNF manages dependencies and places fragments under /etc/php.d; restart the serving service. |
| PECL | An extension is not available as a suitable repository package. | Build against the PHP development environment that matches the target SAPI and PHP version. | You must maintain the compiled extension and its compatibility. Add its ini directive and restart the runtime. |
| phpize/source build | You have source code or a PECL package that must be compiled manually. | The phpize binary and headers must correspond to the PHP installation that will load the module. |
Manual upgrades and security maintenance are your responsibility; configuration and a service restart are required. |
Distribution packages are the default path because the repository handles dependency resolution and receives the operating system’s update stream. PECL or a source build is a fallback, not a reason to bypass a suitable maintained package.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Fallback: install an unavailable extension with PECL or phpize
Use this route only when the normal repository does not contain a compatible package or the available package does not meet the application’s requirements. You need a compiler toolchain and PHP development headers appropriate to the target PHP version; install those prerequisites through your distribution before building.
PECL workflow
PECL can download and compile extensions distributed through the PHP extension ecosystem. Follow the extension’s documented build options, then identify the resulting shared object (normally an .so file) and configure the target SAPI to load it.
phpize workflow
For source distributed with a PHP extension, the documented build sequence is:
phpize
./configure
make
sudo make installphpize prepares the source tree for the PHP installation; ./configure checks available libraries and build options; make compiles the extension; and make install copies the module into PHP’s extension directory. A successful compilation alone does not load the module.
Add the extension directive and restart
Add the module to the ini file read by the target SAPI:
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extension=extname.soOn Debian-family systems, put the directive in the appropriate version/SAPI configuration tree. On DNF systems, an extension fragment under /etc/php.d/ is the usual pattern. Avoid adding the same directive repeatedly in multiple files because duplicate loading can produce startup warnings. Restart Apache or PHP-FPM, then verify through that SAPI.
Troubleshoot “undefined function” after installation
1. Confirm the package actually matches the missing feature
Compare the function or class required by the application with the module package you installed. For example, a database driver, cURL support and image support are separate capabilities. Search the package index again rather than assuming that a similarly named package provides the API you need.
2. Check for a PHP-version mismatch
Run php -v and compare it with the version shown by the web application’s phpinfo() page. A CLI binary can be PHP 8.x while the website is attached to a different PHP-FPM version. Install the module for the runtime that executes the request, or change the application’s configured PHP runtime deliberately.
3. Inspect the loaded ini files
Use php --ini for CLI and the “Loaded Configuration File” plus “Scan this dir for additional .ini files” values in phpinfo() for web requests. Verify that the extension’s ini fragment is in the directory actually scanned by that SAPI.
4. Restart the correct process
Restart Apache, httpd or the applicable PHP-FPM unit after installation or configuration changes. A browser test can continue to hit old workers until the serving process is restarted.
5. Look for startup warnings and dependency errors
Run the relevant PHP binary from a shell and inspect its startup output. Messages such as “unable to load dynamic library” indicate a missing shared-library dependency, an incorrect extension path or a module compiled for another PHP build. Correct the package or build dependency rather than suppressing the warning.
6. Check permissions and service logs
If the CLI test succeeds but web requests fail, inspect the Apache or PHP-FPM service status and logs. The web worker may use a different user, chroot, pool configuration or environment. A module that loads in CLI is not proof that the web worker can access every library it needs.
Quick Recap
Practical installation checklist
- Record the distribution and release with
cat /etc/os-release. - Record the PHP version with
php -v, and identify the web version separately if the site uses Apache, Nginx or PHP-FPM. - Identify the application’s SAPI: CLI, Apache, CGI or FPM.
- Refresh APT metadata or search the enabled DNF repositories.
- Install the package whose name and version match the required extension.
- Check whether Debian’s
phpenmodis needed for explicit enablement. - Inspect the SAPI-specific ini path before editing configuration manually.
- Restart the process that executes PHP requests.
- Verify with
php -mfor CLI andphpinfo()or an application check for web traffic. - If no suitable package exists, use PECL or the
phpizebuild sequence, addextension=extname.so, and repeat the restart and verification steps.
Key points to retain
- Use the Linux distribution package manager whenever it provides a suitable PHP extension.
- Package names differ between systems: Debian/Ubuntu examples include
php-mysql,php-curlandphp-pgsql; DNF examples includephp-mysqlndandphp-gd. - CLI and web SAPIs can load different ini trees, so always test the runtime that runs the application.
- Restart Apache,
httpd, PHP-FPM or the relevant serving process after changing modules. - Reserve PECL and phpize for extensions that are not suitably packaged or maintained in the enabled repositories.
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