How to Set HTTP Response Codes in PHP?

HTTP Response Codes in PHP

Introduction

Handling HTTP response codes in PHP is essential for sending appropriate HTTP status messages to clients. This article explores three methods to set HTTP response codes in PHP, depending on the PHP version and requirements.

Methods to Set HTTP Response Codes

1. Assembling the Response Code (PHP >= 4.0)

The header() function can be used to set custom HTTP response lines. While this method has special use cases, it requires careful consideration for FastCGI PHP.

header("HTTP/1.1 200 OK");

2. 3rd Argument to header Function (PHP >= 4.3)

The header() function provides a third argument for setting the response code. However, the first argument must be a non-empty string. This method offers two options:

header(':', true, 404);
header('X-PHP-Response-Code: 404', true, 404); // Recommended

3. http_response_code Function (PHP >= 5.4)

Introduced in PHP 5.4, the http_response_code() function simplifies the process of setting HTTP response codes.

http_response_code(404);

Compatibility

For PHP versions below 5.4, a custom function can provide compatibility with the http_response_code() functionality:

// For 4.3.0 <= PHP <= 5.4.0
if (!function_exists('http_response_code')) {
    function http_response_code($newcode = NULL) {
        // ...
    }
}

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