How to check if the extension is loaded in php

The operating environment of this article: Windows 10 system, php8.1.3 version, dell g3 computer.

PHP is a widely used server-side scripting language that supports many extensions to enhance its functionality. When developing or maintaining PHP applications, sometimes you need to see if an extension has been loaded. This article will explain how to check whether an extension has been loaded in PHP.

1. Use function extension_loaded

This function accepts a string parameter, which is the name of the extension to be checked. For example, to check whether the `openssl` extension has been loaded, you can use the following code:

if (extension_loaded('openssl')) {
echo 'OpenSSL 扩展已加载';
} else {
echo 'OpenSSL 扩展未加载';
}

This code will print the corresponding message based on the return value of `extension_loaded`.

2. Use the function get_loaded_extensions

This function returns an array containing the names of all loaded extensions. Using this function, we can write a code block that iterates through all loaded extensions:

$loadedExtensions = get_loaded_extensions();
foreach ($loadedExtensions as $extension) {
echo $extension . PHP_EOL;
}

This code will print out the name of each loaded extension, with each extension name occupying one line.

3. Using the function phpinfo

we can generate a complete PHP information page, including detailed information about the loaded extension. Just add the following line to your code:

phpinfo();

Then run the page and a detailed list of all loaded extensions will be displayed.

Although the above methods can view loaded extensions, they cannot provide detailed information for unloaded extensions. In some cases we may also need to see which extensions are enabled in the configuration file.

In PHP, you can obtain the configuration information of the PHP parser through two command line options: `php -i` and `php --ini`. The `php -i` command will output the complete PHP configuration information, which contains information about loaded extensions and configuration file locations. The `php --ini` command displays the location of the PHP configuration file.

Summary

There are several ways to see if an extension has been loaded in PHP. You can use the `extension_loaded` function to check whether an individual extension is loaded, use the `get_loaded_extensions` function to iterate over all loaded extensions, use the `phpinfo` function to generate a detailed extension information page, and use the command line option `php -i` to learn more Configuration information. Through these methods, we can easily understand the extensions used in PHP scripts

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