<?PHP
function recursiveGlob($pattern)
{
    $subPatterns = explode('/**/',$pattern);

    // Get sub dirs
    $dirs = glob(array_shift($subPatterns) . '/*',GLOB_ONLYDIR);

    // Get files in the current dir
    $files = glob($pattern);

    foreach ($dirs as $dir) {
        $subDirList = recursiveGlob($dir . '/**/' . implode('/**/',$subPatterns));

        $files = array_merge($files,$subDirList);
    }

    return $files;
}

像$files = recursiveGlob(“mainDir / ** / * .jpg”)那样使用它;