HTTP错误代码和PHP

HTTP错误代码是HTTP状态码的数字表示，这些状态码由Web服务器发送到客户端的浏览器，以表示请求的结果。这些状态码描述了当前请求的成功或失败状态。PHP可以作为Web服务器脚本编程语言，可以捕捉并处理HTTP错误代码来更好地处理请求。在这篇文章中，我们将讨论一些常见的HTTP错误代码和PHP处理它们的方法。

HTTP错误代码

1xx信息

• 100 Continue
• 101 Switching Protocols
• 102 Processing

2xx成功

• 200 OK
• 201 Created
• 202 Accepted
• 203 Non-authoritative Information
• 204 No Content
• 205 Reset Content
• 206 Partial Content
• 207 Multi-Status
• 208 Already Reported
• 226 IM Used

3xx重定向

• 300 Multiple Choices
• 301 Moved Permanently
• 302 Found
• 303 See Other
• 304 Not Modified
• 305 Use Proxy
• 307 Temporary Redirect
• 308 Permanent Redirect

4xx客户端错误

• 400 Bad Request
• 401 Unauthorized
• 402 Payment Required
• 403 Forbidden
• 404 Not Found
• 405 Method Not Allowed
• 406 Not Acceptable
• 407 Proxy Authentication Required
• 408 Request Timeout
• 409 Conflict
• 410 Gone
• 411 Length Required
• 412 Precondition Failed
• 413 Payload Too Large
• 414 URI Too Long
• 415 Unsupported Media Type
• 416 Range Not Satisfiable
• 417 Expectation Failed
• 418 I'm a teapot
• 421 Misdirected Request
• 422 Unprocessable Entity
• 423 Locked
• 424 Failed Dependency
• 426 Upgrade Required
• 428 Precondition Required
• 429 Too Many Requests
• 431 Request Header Fields Too Large
• 444 Connection Closed Without Response
• 451 Unavailable For Legal Reasons
• 499 Client Closed Request

5xx服务器错误

• 500 Internal Server Error
• 501 Not Implemented
• 502 Bad Gateway
• 503 Service Unavailable
• 504 Gateway Timeout
• 505 HTTP Version Not Supported
• 506 Variant Also Negotiates
• 507 Insufficient Storage
• 508 Loop Detected
• 509 Bandwidth Limit Exceeded
• 510 Not Extended
• 511 Network Authentication Required
• 599 Network Connect Timeout Error

PHP处理HTTP错误代码

当使用PHP编写Web应用程序时，我们可能会遇到各种不同的HTTP错误代码。以下是一些处理HTTP错误代码的方法。

捕捉HTTP错误代码

可以使用$_SERVER超全局变量捕捉当前请求的HTTP状态码：

$http_status = http_response_code();

if ($http_status == "404") {
  echo "404 Not Found";
}

重定向

PHP可以通过header()函数将请求重定向到其他URL：

header("Location: http://www.new-url.com");
exit;

生成自定义错误

使用die()函数可以生成自定义错误：

if ($http_status == "404") {
  die("Sorry, the page you are looking for does not exist.");
}

自定义错误处理程序

使用set_error_handler()函数可以创建自定义PHP错误处理程序：

function customErrorHandler($errno, $errstr, $errfile, $errline) {
  echo "<b>Error:</b> [$errno] $errstr<br>";
  echo "  Fatal error on line $errline in file $errfile";
  echo ", PHP " . PHP_VERSION . " (" . PHP_OS . ")<br>";
  echo "Aborting...<br>";
  exit(1);
}

set_error_handler("customErrorHandler");

结论

通过了解HTTP错误代码和如何在PHP中处理它们，您可以更好地处理Web请求，让Web应用程序更加可靠。