php - 在 PHP 中发送 HTTP 响应代码的最佳方式

Question

通过阅读 php 规范和 Stack Overflow 上的其他问题，我可以看到三种从 PHP 发送 HTTP 响应代码的方法:

header("HTTP/1.0 404 Not Found");
           ^      ^     ^
           A      B     C

header(" ", false, 404);
        ^     ^     ^
        C     D     B

http_response_code(404);
                    ^
                    B

A: Defines HTTP header
B: Response code
C: Message
D: To replace previous header or not

这些有什么区别，哪个最好用？我对参数的理解是否正确？

谢谢，

图兹里达。

Answer 1

为了回答您关于有何区别的问题，我找到了 this comment在 PHP 文档中(感谢 Steven):

http_response_code is basically a shorthand way of writing a http status header, with the added bonus that PHP will work out a suitable Reason Phrase to provide by matching your response code to one of the values in an enumeration it maintains within php-src/main/http_status_codes.h. Note that this means your response code must match a response code that PHP knows about. You can't create your own response codes using this method, however you can using the header method.

In summary - The differences between http_response_code and header for setting response codes:

1. Using http_response_code will cause PHP to match and apply a Reason Phrase from a list of Reason Phrases that are hard-coded into the PHP source code.

2. Because of point 1 above, if you use http_response_code you must set a code that PHP knows about. You can't set your own custom code, however you can set a custom code (and Reason Phrase) if you use the header method.

---

我很好奇一些流行的框架是如何在标准响应中发送 header 的:

Symfony (和 Laravel ，通过继承)设置原始 header :

// status
header(sprintf('HTTP/%s %s %s', $this->version, $this->statusCode, $this->statusText), true, $this->statusCode);

Zend Framework 2还设置原始 header :

public function renderStatusLine()
{
    $status = sprintf(
        'HTTP/%s %d %s',
        $this->getVersion(),
        $this->getStatusCode(),
        $this->getReasonPhrase()
    );
    return trim($status);
}

Yii也是如此

protected function sendHeaders()
{
    if (headers_sent()) {
        return;
    }
    $statusCode = $this->getStatusCode();
    header("HTTP/{$this->version} $statusCode {$this->statusText}");
    // ...