PHP curl库有哪些高级用法

PHP的cURL库提供了许多高级功能，可以帮助您更好地处理HTTP请求。以下是一些常见的高级用法：

1. 发送POST请求：

$url = "https://example.com/api";
$data = array("key" => "value");
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));
$response = curl_exec($ch);
curl_close($ch);

2. 设置自定义请求头：

$headers = array(
    "Content-Type: application/json",
    "Authorization: Bearer YOUR_ACCESS_TOKEN"
);
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
$response = curl_exec($ch);
curl_close($ch);

3. 上传文件：

$file = "@/path/to/your/file.jpg";
$data = array("file" => $file);
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
$response = curl_exec($ch);
curl_close($ch);

4. 使用代理：

$proxy = "http://proxy.example.com:8080";
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_PROXY, $proxy);
$response = curl_exec($ch);
curl_close($ch);

5. 设置超时和连接超时：

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_TIMEOUT, 30); // 设置超时时间为30秒
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10); // 设置连接超时时间为10秒
$response = curl_exec($ch);
curl_close($ch);

6. 关注请求进度：

function progressCallback($downloadSize, $downloaded, $uploadSize, $uploaded) {
    echo "Downloaded: $downloaded / $downloadSize\n";
    echo "Uploaded: $uploaded / $uploadSize\n";
}

$ch = curl_init($url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_NOPROGRESS, false);
curl_setopt($ch, CURLOPT_PROGRESSFUNCTION, 'progressCallback');
$response = curl_exec($ch);
curl_close($ch);

这些高级用法只是cURL库功能的一部分。您可以查阅PHP官方文档以获取更多关于cURL库的信息：https://www.php.net/manual/en/book.curl.php