PHP获取HTTP请求头方法

$headers = getallheaders();
if ($headers) {
    foreach ($headers as $name => $value) {
        echo "$name: $value 
";
    }
}
// 示例输出：
// User-Agent: Mozilla/5.0
// Authorization: Bearer xxxxx
// Content-Type: application/json

$userAgent = $_SERVER['HTTP_USER_AGENT'] ?? '';
$authorization = $_SERVER['HTTP_AUTHORIZATION'] ?? '';
$contentType = $_SERVER['CONTENT_TYPE'] ?? $_SERVER['HTTP_CONTENT_TYPE'] ?? '';

$opts = [
    'http' => [
        'method' => 'GET',
        'header' => "Authorization: Bearer token123\r\n" .
                    "User-Agent: MyApp/1.0\r\n"
    ]
];
$context = stream_context_create($opts);
$result = file_get_contents('https://api.example.com/user', false, $context);

// 获取响应头
$meta = stream_get_meta_data($http_response_header);
$responseHeaders = $http_response_header; // 此变量由PHP自动填充

foreach ($responseHeaders as $header) {
    echo $header . "
";
}

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api.example.com/data');
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true); // 包含头信息
curl_setopt($ch, CURLOPT_NOBODY, false);

$response = curl_exec($ch);
$headerSize = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
$headers = substr($response, 0, $headerSize);
$body = substr($response, $headerSize);

// 解析响应头
foreach (explode("\r\n", $headers) as $header) {
    if (strpos($header, ':') !== false) {
        list($name, $value) = explode(': ', $header, 2);
        echo "$name: $value 
";
    }
}
curl_close($ch);