README

WPCompat is a PHPStan extension which helps verify that your PHP code is compatible with a given version of WordPress. You can use it to help ensure that your plugin or theme remains compatible with its "Requires at least" version.

It works by checking that the declared @since version of any WordPress functions or class methods that are in use is lower than or equal to the minimum version of WordPress that your code supports. For example, if your plugin or theme supports WordPress 6.0 or higher but the get_template_hierarchy() function is used unconditionally, the extension will trigger an error because that function was only introduced in WordPress 6.1.

If your code is correctly guarded with a valid function_exists() or method_exists() check then an error won't be triggered.

Status

WPCompat is a relatively new extension and may not yet be exhaustive in its checks.

Version information for functions and methods was last updated for WordPress 6.7.

Requirements

• PHPStan 2.0 or higher
• PHP 7.4 or higher (tested up to PHP 8.4)

Installation

composer require --dev johnbillion/wp-compat

If you also install phpstan/extension-installer then you're all set!

includes:
    - vendor/johnbillion/wp-compat/extension.neon

Configuration

Themes

If your style.css file contains a "Requires at least" header then wp-compat will read this header and use its value as the minimum supported WordPress version. There is no need for any additional config.

Plugins

If the name of your main plugin file matches its parent directory -- for example my-plugin/my-plugin.php -- then wp-compat will read the "Requires at least" header from this file and use its value as the minimum supported WordPress version. There is no need for any additional config.

If your main plugin file is named otherwise or located elsewhere, you can specify its name in your PHPStan config file:

parameters:
    WPCompat:
        pluginFile: my-plugin.php

Manual config

Alternatively you can specify the minimum supported WordPress version number of your plugin or theme directly in your PHPStan config file. Note that this must be a string so it must be wrapped in quote marks.

parameters:
    WPCompat:
        requiresAtLeast: '6.0'

Any version number in major.minor or major.minor.patch format is accepted.

Ignoring errors

You can ignore an error from this extension by using its error identifiers. For full information, see the PHPStan guide to ignoring errors.

// @phpstan-ignore WPCompat.functionNotAvailable
wp_foo();

// @phpstan-ignore WPCompat.methodNotAvailable
WP::foo();

Technical details

This extension does not scan your project in order to detect the @since versions of WordPress functions and methods. This information is included in the symbols.json file that's included in the extension. This approach ensures that your code is always tested against the most up to date and most accurate @since documentation, regardless of the version of WordPress that your tests are using.

The symbols.json file contains a dictionary of all functions and methods in WordPress along with the version of WordPress in which they were introduced.

The file can be regenerated by running:

composer generate

The JSON schema for the file can be found in schemas/symbols.json.

License

MIT