PHP递归目录的5种方法

<?php
//方法一：使用glob循环

function myscandir1($path, &$arr) {

    foreach (glob($path) as $file) {
        if (is_dir($file)) {
            myscandir1($file . '/*', $arr);
        } else {

            $arr[] = realpath($file);
        }
    }
}

//方法二：使用dir && read循环
function myscandir2($path, &$arr) {

    $dir_handle = dir($path);
    while (($file = $dir_handle->read()) !== false) {

        $p = realpath($path . '/' . $file);
        if ($file != "." && $file != "..") {
            $arr[] = $p;
        }

        if (is_dir($p) && $file != "." && $file != "..") {
            myscandir2($p, $arr);
        }
    }
}

//方法三：使用opendir && readdir循环
function myscandir3($path, &$arr) {

    $dir_handle = opendir($path);
    while (($file = readdir($dir_handle)) !== false) {

        $p = realpath($path . '/' . $file);
        if ($file != "." && $file != "..") {
            $arr[] = $p;
        }
        if (is_dir($p) && $file != "." && $file != "..") {
            myscandir3($p, $arr);
        }
    }
}

//方法四：使用scandir循环
function myscandir4($path, &$arr) {

    $dir_handle = scandir($path);
    foreach ($dir_handle as $file) {

        $p = realpath($path . '/' . $file);
        if ($file != "." && $file != "..") {
            $arr[] = $p;
        }
        if (is_dir($p) && $file != "." && $file != "..") {
            myscandir4($p, $arr);
        }
    }
}

//方法五：使用SPL循环
function myscandir5($path, &$arr) {

    $iterator = new DirectoryIterator($path);
    foreach ($iterator as $fileinfo) {

        $file = $fileinfo->getFilename();
        $p = realpath($path . '/' . $file);
        if (!$fileinfo->isDot()) {
            $arr[] = $p;
        }
        if ($fileinfo->isDir() && !$fileinfo->isDot()) {
            myscandir5($p, $arr);
        }
    }
}

//可以用xdebug测试运行时间
myscandir1('./Code',$arr1);//0.164010047913
myscandir2('./Code',$arr2);//0.243014097214
myscandir3('./Code',$arr3);//0.233012914658
myscandir4('./Code',$arr4);//0.240014076233
myscandir5('./Code',$arr5);//0.329999923706 

//需要安装xdebug
echo xdebug_time_index(), "\n";
?>