bueltge/wp-rest-api-filter-items

<?php
/**
 * reads in a whole directory at once to cache the existing files
 * to avoid frequently usage of file_exists() checks
 */

namespace Requisite\Loader;


class DirectoryCacheFileLoader implements FileLoaderInterface {

    /**
     * @type array
     */
    private $files = array();

    /**
     * @type string
     */
    private $extension;

    /**
     * @type string
     */
    private $base_dir;

    /**
     * @param string $base_dir
     * @param string $extension
     */
    function __construct( $base_dir, $extension = '.php' ) {

        $this->base_dir  = (string) $base_dir;
        $this->extension = (string) $extension;
    }

    /**
     * @param string $file
     * @return bool
     */
    public function loadFile( $file ) {

        if ( empty( $this->files ) )
            $this->files = $this->readDirRecursive(
                $this->base_dir,
                '*' . $this->extension
            );

        if ( ! in_array( $file, $this->files ) )
            return FALSE;

        require_once $file;
        return TRUE;
    }

    /**
     * read the subdirectory recursive and catch all files with the
     * given pattern
     *
     * Will return an array with the pattern as element if no file exists
     *
     * @param $dir
     * @param $pattern
     * @return array
     */
    public function readDirRecursive( $dir, $pattern ) {

        $sub_dirs = glob( $dir . '/*', \GLOB_ONLYDIR );
        $files = array();
        if ( ! empty( $sub_dirs ) ) {
            foreach ( $sub_dirs as $sub_dir ) {
                $files = array_merge( $files, $this->readDirRecursive( $sub_dir, $pattern ) );
            }
        }
        $files = array_merge( $files, glob( $dir . '/' . $pattern, \GLOB_NOCHECK ) );

        return $files;
    }
}