main

<?php

/* HEADER */ // phpcs:ignore

​

/**

 * This class handles management of the actual PHP autoloader.

 */

class PHP_Autoloader {

​

    /**

     * Registers the autoloader with PHP so that it can begin autoloading classes.

     *

     * @param Version_Loader $version_loader The class loader to use in the autoloader.

     */

    public function register_autoloader( $version_loader ) {

        // Make sure no other autoloaders are registered.

        $this->unregister_autoloader();

​

        // Set the global so that it can be used to load classes.

        global $jetpack_autoloader_loader;

        $jetpack_autoloader_loader = $version_loader;

​

        // Ensure that the autoloader is first to avoid contention with others.

        spl_autoload_register( array( self::class, 'load_class' ), true, true );

    }

​

    /**

     * Unregisters the active autoloader so that it will no longer autoload classes.

     */

    public function unregister_autoloader() {

        // Remove any v2 autoloader that we've already registered.

        $autoload_chain = spl_autoload_functions();

        foreach ( $autoload_chain as $autoloader ) {

            // We can identify a v2 autoloader using the namespace.

            $namespace_check = null;

​

            // Functions are recorded as strings.

            if ( is_string( $autoloader ) ) {

                $namespace_check = $autoloader;

            } elseif ( is_array( $autoloader ) && is_string( $autoloader[0] ) ) {

                // Static method calls have the class as the first array element.

                $namespace_check = $autoloader[0];

            } else {

                // Since the autoloader has only ever been a function or a static method we don't currently need to check anything else.

                continue;

            }

​

            // Check for the namespace without the generated suffix.

            if ( 'Automattic\\Jetpack\\Autoloader\\jp' === substr( $namespace_check, 0, 32 ) ) {

                spl_autoload_unregister( $autoloader );

            }

        }

​

        // Clear the global now that the autoloader has been unregistered.

        global $jetpack_autoloader_loader;

        $jetpack_autoloader_loader = null;

    }

​

    /**

     * Loads a class file if one could be found.

     *

     * Note: This function is static so that the autoloader can be easily unregistered. If

     * it was a class method we would have to unwrap the object to check the namespace.

     *