js 跨域请求

<?php
$name = $_SERVER["QUERY_STRING"];
$callback = $_GET[‘callback‘];

function getfiles($path){
    global $callback;
    $i = 0;
    $data = array();
    foreach(scandir($path) as $afile){
        if($afile==‘.‘||$afile==‘..‘)
            continue;
        if(is_dir($path.‘/‘.$afile)) {
            getfiles($path.‘/‘.$afile);
        } else {
            $data[$i+1] = $afile;
            $i = $i + 1;
        }
    }
    return $callback.‘(‘.json_encode(array(‘result‘=>0,‘data‘=>$data)) . ‘)‘;
}

function match($text, $lb = ‘^‘, $rb = ‘$‘) {
    if ($lb == ‘‘) $lb = ‘^‘;
    if ($rb == ‘‘) $rb = ‘$‘;
    $pattern = "/(?<=$lb)(.*?)(?=$rb)/";
    if (preg_match($pattern, $text, $matches)){
        return $matches[0];
    } else {
        return ‘‘;
    }
}
$name = match($name,‘name=‘,‘&‘);
echo getfiles($name);