RecursiveDirectoryIterator在管理员中不起作用

我下面的功能在查看网站前端时不会出错。但当我登录到管理区域时，会导致致命错误。错误表明它无法再找到该文件夹。

//req all the php files in current & sub dirs.
function req_php_files($filepath) {
    $Directory = new RecursiveDirectoryIterator($filepath);
    $Iterator = new RecursiveIteratorIterator($Directory);
    $Regex = new RegexIterator($Iterator, \'/^.+\\.php$/i\', RecursiveRegexIterator::GET_MATCH);

    $php_files = array();

    foreach ($Regex as $file) {
        array_push($php_files, $file[0]);
    }
    foreach ($php_files as $req_file) {
        require_once $req_file;
    }
}
req_php_files(\'wp-content/themes/vac3/acf\');

PHP Fatal error: Uncaught exception \'UnexpectedValueException\' with message \'RecursiveDirectoryIterator::__construct(wp-content/themes/vac3/acf): failed to open dir: No such file or directory\' in /Applications/MAMP/htdocs/vac3/wp-content/themes/vac3/functions.php:177

为什么这个功能在网站的前端工作，而我在登录admin时却不工作？

// Use the proper filter – below just as example add_filter( \'wp_loaded\', function() { // Only serve for public requests if ( is_admin() ) return; $Iterator = new RecursiveIteratorIterator( new RecursiveDirectoryIterator( get_template_directory().\'/acf\' ) ); $Regex = new RegexIterator( $Iterator, \'/^.+\\.php$/i\', RecursiveRegexIterator::GET_MATCH ); foreach ( $Regex as $file ) require_once $file[0]; } );

add_action( \'wp_loaded\', function() { if ( is_admin() ) return; $files = new \\FilesystemIterator( get_template_directory().\'/acf\', \\FilesystemIterator::SKIP_DOTS | FilesystemIterator::FOLLOW_SYMLINKS | FilesystemIterator::CURRENT_AS_PATHNAME ); foreach ( $files as $file ) { /** @noinspection PhpIncludeInspection */ ! $files->isDir() and include $files->getRealPath(); } } );

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