Managing PHP Extensions

PHP extensions add runtime modules such as pdo_mysql, gd and intl.

What It Does

PHP extensions add runtime modules such as pdo_mysql, gd and intl. The following examples distinguish a normal use case, a boundary case and a practical application.

Requirements and Compatibility

PHP 8.x and a local test environment. Apply input validation, correct error handling and the requirements of any optional libraries.

The code focuses on the core concept. Production implementation may also need routes, validation, persistence, authorization or deployment tooling.

Example 1: Basic Behavior

List installed CLI modules and the loaded configuration files.

php -m
php --ini

This is a command-line example; use it in its appropriate file or shell, not in the PHP source editor.

Example 2: Another Case

Confirm the specific PDO or other module needed by the application.

php -r "var_dump(extension_loaded('pdo_mysql'));"

This is a command-line example; use it in its appropriate file or shell, not in the PHP source editor.

Practical Example: Putting It to Use

Handle missing extensions before entering the application code path.

<?php
$required = ["json", "openssl", "pdo"];
$missing = array_filter($required, fn ($ext) => !extension_loaded($ext));
echo $missing ? implode(", ", $missing) : "All required modules loaded";

Important Behavior and Edge Cases

An extension available in CLI may be missing in PHP-FPM, and php.ini loading differs by SAPI.

Comparison with Related Functions or Approaches

Common Beginner Mistakes

Key Takeaways

• PHP extensions add runtime modules such as pdo_mysql, gd and intl.
• An extension available in CLI may be missing in PHP-FPM, and php.ini loading differs by SAPI.
• Check extension_loaded() and the deployed runtime's module list.

Before adapting these examples, verify the return values, test the failure paths and confirm that your application meets its security and environment requirements.