写一个PHP函数,实现扫描并打印出自定目录下(含子目录)的所有jpg文件名

<?php

$dir = "E:\照片\\";

//打印文件夹中所有jpg文件
function printJpg($dir,$deep = ""){
    $dirSource = dir($dir);

    while($d = $dirSource->read()){
        if($d == "." || $d == ".."){
            continue;
        }
        if(filetype($dir.$d) == "dir"){
            printJpg($dir.$d."/",$deep."--");
        }

        if(mime_content_type($dir.$d) == "image/jpeg"){

            echo $deep.$d."<br/>";
        }
    }
}

printJpg($dir);