79 lines
2.1 KiB
PHP
79 lines
2.1 KiB
PHP
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<?php
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declare(strict_types=1);
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// 参数验证函数
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function validateRequestParams(): array {
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$allowedResolutions = ['UHD', '4K', 'HD'];
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$allowedCategories = ['美女', '风景', '动物', '游戏'];
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// 获取并处理参数
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$params = [
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'resolution' => isset($_GET['resolution'])
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? strtoupper(trim($_GET['resolution']))
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: null,
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'category' => isset($_GET['category'])
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? urldecode(trim($_GET['category']))
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: null
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];
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// 验证分辨率参数
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if ($params['resolution'] && !in_array($params['resolution'], $allowedResolutions, true)) {
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throw new InvalidArgumentException('无效的分辨率参数');
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}
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// 验证分类参数
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if ($params['category'] && !in_array($params['category'], $allowedCategories, true)) {
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throw new InvalidArgumentException('无效的分类参数');
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}
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return $params;
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}
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// 构建图片查询语句
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function buildImageQuery(array $params): string {
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$query = "SELECT url FROM images WHERE 1=1";
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if ($params['resolution']) {
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$query .= " AND resolution = :resolution";
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}
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if ($params['category']) {
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$query .= " AND category = :category";
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}
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$query .= " ORDER BY RAND() LIMIT 1";
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return $query;
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}
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// 获取随机图片
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function fetchRandomImage(PDO $pdo, string $query, array $params) {
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$stmt = $pdo->prepare($query);
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if ($params['resolution']) {
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$stmt->bindValue(':resolution', $params['resolution']);
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}
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if ($params['category']) {
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$stmt->bindValue(':category', $params['category']);
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}
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$stmt->execute();
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return $stmt->fetch();
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}
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// 标准化JSON响应
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function jsonResponse(array $data): string {
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return json_encode([
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'code' => 200,
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'data' => $data
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], JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT);
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}
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// 错误响应格式化
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function jsonError(string $message, int $code = 400): string {
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http_response_code($code);
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return json_encode([
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'code' => $code,
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'error' => $message
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], JSON_UNESCAPED_SLASHES | JSON_PRETTY_PRINT);
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}
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