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<?php
/**
* Polyfill for SPL autoload feature. This file is separate to prevent compiler notices
* on the deprecated __autoload() function.
*
* See https://core.trac.wordpress.org/ticket/41134
*
* @package PHP
* @access private
*/
if ( ! function_exists( 'spl_autoload_register' ) ) {
$_wp_spl_autoloaders = array();
/**
* Autoloader compatibility callback.
*
* @since 4.6.0
*
* @param string $classname Class to attempt autoloading.
*/
function __autoload( $classname ) {
global $_wp_spl_autoloaders;
foreach ( $_wp_spl_autoloaders as $autoloader ) {
if ( ! is_callable( $autoloader ) ) {
// Avoid the extra warning if the autoloader isn't callable.
continue;
}
call_user_func( $autoloader, $classname );
// If it has been autoloaded, stop processing.
if ( class_exists( $classname, false ) ) {
return;
}
}
}
/**
* Registers a function to be autoloaded.
*
* @since 4.6.0
*
* @param callable $autoload_function The function to register.
* @param bool $throw Optional. Whether the function should throw an exception
* if the function isn't callable. Default true.
* @param bool $prepend Whether the function should be prepended to the stack.
* Default false.
*/
function spl_autoload_register( $autoload_function, $throw = true, $prepend = false ) {
if ( $throw && ! is_callable( $autoload_function ) ) {
// String not translated to match PHP core.
throw new Exception( 'Function not callable' );
}
global $_wp_spl_autoloaders;
// Don't allow multiple registration.
if ( in_array( $autoload_function, $_wp_spl_autoloaders ) ) {
return;
}
if ( $prepend ) {
array_unshift( $_wp_spl_autoloaders, $autoload_function );
} else {
$_wp_spl_autoloaders[] = $autoload_function;
}
}
/**
* Unregisters an autoloader function.
*
* @since 4.6.0
*
* @param callable $function The function to unregister.
* @return bool True if the function was unregistered, false if it could not be.
*/
function spl_autoload_unregister( $function ) {
global $_wp_spl_autoloaders;
foreach ( $_wp_spl_autoloaders as &$autoloader ) {
if ( $autoloader === $function ) {
unset( $autoloader );
return true;
}
}
return false;
}
/**
* Retrieves the registered autoloader functions.
*
* @since 4.6.0
*
* @return array List of autoloader functions.
*/
function spl_autoload_functions() {
return $GLOBALS['_wp_spl_autoloaders'];
}
}
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