<?php
// 路径计算
$filenames = $stmt->fetchAll(PDO::FETCH_COLUMN, 0); // 从数据库取出的文件名
$random_filename = $filenames[array_rand($filenames)]; // 随机一个文件名
$push_path = $base_img_path . $random_filename; // 相对路径
$imageUrl = $baseURL . $push_path; // URL

// 返还数据
if (empty($mode)) {
    header('Content-Type: image/jpeg');
    header('Content-Length: ' . filesize($push_path));
    readfile($push_path);
    exit;
} elseif ($mode == 'json') {
    header('Content-Type: application/json');
    echo json_encode(['code' => 200, 'image_url' => $imageUrl, 'endpoint_type' => $et, 'time' => $time, 'is_source' => $source, 'mode' => 'json']);
    exit;
} elseif ($mode == 'redirect') {
    header('Location: ' . $imageUrl);
    exit;
} else {
    header('Location: ' . $imageUrl);
    exit;
}
?>