{"name":"01-02.jpg","url":"https://pb.yanshu.work/image/5dc7e14c6ab7c","size":"647.636kb","width":"1280","height":"783"}

<?php
$url = explode("\n", file_get_contents('url.txt'));//url数组
$i = array_rand($url);//随机id
$arr = json_decode($url[$i], true); //获取txt文本中随机一行，并将其转换为json格式
$x = ($arr['url']);//随机图片url
$id = $_REQUEST['id'];
$type = $_REQUEST['type'];
switch ($type) {
    case 'json':
        $result = array("code" => "200", "url" => "{$x}");
        $result['id']=$i;
        $result['name']="{$arr['name']}";
        $result['size'] = "{$arr['size']}";
        $result['width'] = "{$arr['width']}";
        $result['height'] = "{$arr['height']}";
        header('Access-Control-Allow-Origin:*'); 
        header('Content-type:text/json');
        echo json_encode($result);
        break;
    case 'js':
        header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
        header("Cache-Control: no-cache");
        header("Pragma: no-cache");
        header("Content-type:application/x-javascript");
        echo "var pic_random=" . "'" . $x . "'" . ";";
        echo "var pic_end=" . count($url) . ";";
        echo "var pic_rdn=" . $i . ";";
        break;
    default:
        if ($id == "") {
            header("Location:$x");
        } else {
            $x = json_decode($url[$id], true)['url'];
            header("Location:$x");
        }
}