| 1 | | <?php |
| 2 | | /** |
| 3 | | * Polyfill for SPL autoload feature. This file is separate to prevent compiler notices |
| 4 | | * on the deprecated __autoload() function. |
| 5 | | * |
| 6 | | * See https://core.trac.wordpress.org/ticket/41134 |
| 7 | | * |
| 8 | | * @package PHP |
| 9 | | * @access private |
| 10 | | */ |
| 11 | | |
| 12 | | if ( ! function_exists( 'spl_autoload_register' ) ) { |
| 13 | | $_wp_spl_autoloaders = array(); |
| 14 | | |
| 15 | | /** |
| 16 | | * Autoloader compatibility callback. |
| 17 | | * |
| 18 | | * @since 4.6.0 |
| 19 | | * |
| 20 | | * @param string $classname Class to attempt autoloading. |
| 21 | | */ |
| 22 | | function __autoload( $classname ) { |
| 23 | | global $_wp_spl_autoloaders; |
| 24 | | foreach ( $_wp_spl_autoloaders as $autoloader ) { |
| 25 | | if ( ! is_callable( $autoloader ) ) { |
| 26 | | // Avoid the extra warning if the autoloader isn't callable. |
| 27 | | continue; |
| 28 | | } |
| 29 | | |
| 30 | | call_user_func( $autoloader, $classname ); |
| 31 | | |
| 32 | | // If it has been autoloaded, stop processing. |
| 33 | | if ( class_exists( $classname, false ) ) { |
| 34 | | return; |
| 35 | | } |
| 36 | | } |
| 37 | | } |
| 38 | | |
| 39 | | /** |
| 40 | | * Registers a function to be autoloaded. |
| 41 | | * |
| 42 | | * @since 4.6.0 |
| 43 | | * |
| 44 | | * @param callable $autoload_function The function to register. |
| 45 | | * @param bool $throw Optional. Whether the function should throw an exception |
| 46 | | * if the function isn't callable. Default true. |
| 47 | | * @param bool $prepend Whether the function should be prepended to the stack. |
| 48 | | * Default false. |
| 49 | | */ |
| 50 | | function spl_autoload_register( $autoload_function, $throw = true, $prepend = false ) { |
| 51 | | if ( $throw && ! is_callable( $autoload_function ) ) { |
| 52 | | // String not translated to match PHP core. |
| 53 | | throw new Exception( 'Function not callable' ); |
| 54 | | } |
| 55 | | |
| 56 | | global $_wp_spl_autoloaders; |
| 57 | | |
| 58 | | // Don't allow multiple registration. |
| 59 | | if ( in_array( $autoload_function, $_wp_spl_autoloaders ) ) { |
| 60 | | return; |
| 61 | | } |
| 62 | | |
| 63 | | if ( $prepend ) { |
| 64 | | array_unshift( $_wp_spl_autoloaders, $autoload_function ); |
| 65 | | } else { |
| 66 | | $_wp_spl_autoloaders[] = $autoload_function; |
| 67 | | } |
| 68 | | } |
| 69 | | |
| 70 | | /** |
| 71 | | * Unregisters an autoloader function. |
| 72 | | * |
| 73 | | * @since 4.6.0 |
| 74 | | * |
| 75 | | * @param callable $function The function to unregister. |
| 76 | | * @return bool True if the function was unregistered, false if it could not be. |
| 77 | | */ |
| 78 | | function spl_autoload_unregister( $function ) { |
| 79 | | global $_wp_spl_autoloaders; |
| 80 | | foreach ( $_wp_spl_autoloaders as &$autoloader ) { |
| 81 | | if ( $autoloader === $function ) { |
| 82 | | unset( $autoloader ); |
| 83 | | return true; |
| 84 | | } |
| 85 | | } |
| 86 | | |
| 87 | | return false; |
| 88 | | } |
| 89 | | |
| 90 | | /** |
| 91 | | * Retrieves the registered autoloader functions. |
| 92 | | * |
| 93 | | * @since 4.6.0 |
| 94 | | * |
| 95 | | * @return array List of autoloader functions. |
| 96 | | */ |
| 97 | | function spl_autoload_functions() { |
| 98 | | return $GLOBALS['_wp_spl_autoloaders']; |
| 99 | | } |
| 100 | | } |