API随机获取图片代码

<?php
    $counter = intval(file_get_contents("counter.dat"));
    $_SESSION['#'] = true;
    $counter++;
    $fp = fopen("counter.dat", "w");
    fwrite($fp, $counter);
    fclose($fp);
?>

<?php
//获取图片文件的绝对路径
$path = dirname(__FILE__);
$filename = $path."/img.txt";

if (!file_exists($filename)) {
    die('文件不存在');
}

//读取图片链接到数组
$pics = [];
$fs = fopen($filename, "r");
while (!feof($fs)) {
    $line = trim(fgets($fs));
    if ($line != '') {
        array_push($pics, $line);
    }
}

//随机获取一个图片链接
$pic = $pics[array_rand($pics)];

//判断输出格式
if (isset($_GET['type']) && $_GET['type'] === 'json') {
    header('Content-type:text/json');
    die(json_encode(['pic' => $pic], JSON_UNESCAPED_UNICODE));
} else {
    die(header("Location: $pic"));
}