Mocking different HTTP status codes, useful for testing error handling.

http-status-code.php

<?php
/* For stimulating different HTTP status code.
 * Example usage: curl -i "http://example.com/index.php/418"
 */
 
$status = [
	200 => 'OK',
	201 => 'Created',
	200 => 'OK',
	201 => 'Created',
	202 => 'Accepted',
	203 => 'Non-Authoritative Information',
	204 => 'No Content',
	205 => 'Reset Content',
	206 => 'Partial Content',
	207 => 'Multi-Status (WebDAV)',
	208 => 'Already Reported (WebDAV)',
	226 => 'IM Used',
	300 => 'Multiple Choices',
	301 => 'Moved Permanently',
	302 => 'Found',
	303 => 'See Other',
	304 => 'Not Modified',
	305 => 'Use Proxy',
	306 => '(Unused)',
	307 => 'Temporary Redirect',
	308 => 'Permanent Redirect (experimental)',
 	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 => 'Request Entity Too Large',
	414 => 'Request-URI Too Long',
	415 => 'Unsupported Media Type',
	416 => 'Requested Range Not Satisfiable',
	417 => 'Expectation Failed',
	418 => "I'm a teapot (RFC 2324)",
	420 => 'Enhance Your Calm (Twitter)',
	422 => 'Unprocessable Entity (WebDAV)',
	423 => 'Locked (WebDAV)',
	424 => 'Failed Dependency (WebDAV)',
	425 => 'Reserved for WebDAV',
	426 => 'Upgrade Required',
	428 => 'Precondition Required',
	429 => 'Too Many Requests',
	431 => 'Request Header Fields Too Large',
	444 => 'No Response (Nginx)',
	449 => 'Retry With (Microsoft)',
	450 => 'Blocked by Windows Parental Controls (Microsoft)',
	451 => 'Unavailable For Legal Reasons',
	499 => 'Client Closed Request (Nginx)',
	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 (Experimental)',
	507 => 'Insufficient Storage (WebDAV)',
	508 => 'Loop Detected (WebDAV)',
	509 => 'Bandwidth Limit Exceeded (Apache)',
	510 => 'Not Extended',
	511 => 'Network Authentication Required',
	598 => 'Network read timeout error',
	599 => 'Network connect timeout error',
];

$code = determineCode();
http_response_code($code);
if (isset($status[$code])) {
    echo $status[$code];
}

/**
 * Determine the code to stimulate, by checking the last segment of URL path.
 * E.g. http://example.com/index.php/404 => 404
 * Return 200 if no code defined.
 */
function determineCode(): int {
    $path = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);
    if ($path == '/') {
        return 200;
    }
    
    $segments = explode('/', rtrim($path, '/'));
    return intval(end($segments));
}