Get HTTP Status Code – PHP Functions

Below are some useful solutions (php functions) for HTTP Status Codes returned in the required page header by servers when loading a web page.

global $http_status_code;
$http_status_code = [
	// ~~~ officially known https codes
	100 => 'Continue',
	101 => 'Switching Protocols',
	102 => 'Processing', // WebDAV; RFC 2518
	103 => 'Early Hints', // RFC 8297
	200 => 'OK',
	201 => 'Created',
	202 => 'Accepted',
	203 => 'Non-Authoritative Information', // since HTTP/1.1
	204 => 'No Content',
	205 => 'Reset Content',
	206 => 'Partial Content', // RFC 7233
	207 => 'Multi-Status', // WebDAV; RFC 4918
	208 => 'Already Reported', // WebDAV; RFC 5842
	226 => 'IM Used', // RFC 3229
	300 => 'Multiple Choices',
	301 => 'Moved Permanently',
	302 => 'Found', // Previously "Moved temporarily"
	303 => 'See Other', // since HTTP/1.1
	304 => 'Not Modified', // RFC 7232
	305 => 'Use Proxy', // since HTTP/1.1
	306 => 'Switch Proxy',
	307 => 'Temporary Redirect', // since HTTP/1.1
	308 => 'Permanent Redirect', // RFC 7538
	400 => 'Bad Request',
	401 => 'Unauthorized', // RFC 7235
	402 => 'Payment Required',
	403 => 'Forbidden',
	404 => 'Not Found',
	405 => 'Method Not Allowed',
	406 => 'Not Acceptable',
	407 => 'Proxy Authentication Required', // RFC 7235
	408 => 'Request Timeout',
	409 => 'Conflict',
	410 => 'Gone',
	411 => 'Length Required',
	412 => 'Precondition Failed', // RFC 7232
	413 => 'Payload Too Large', // RFC 7231
	414 => 'URI Too Long', // RFC 7231
	415 => 'Unsupported Media Type', // RFC 7231
	416 => 'Range Not Satisfiable', // RFC 7233
	417 => 'Expectation Failed',
	418 => 'I\'m a teapot', // RFC 2324, RFC 7168
	421 => 'Misdirected Request', // RFC 7540
	422 => 'Unprocessable Entity', // WebDAV; RFC 4918
	423 => 'Locked', // WebDAV; RFC 4918
	424 => 'Failed Dependency', // WebDAV; RFC 4918
	425 => 'Too Early', // RFC 8470
	426 => 'Upgrade Required',
	428 => 'Precondition Required', // RFC 6585
	429 => 'Too Many Requests', // RFC 6585
	431 => 'Request Header Fields Too Large', // RFC 6585
	451 => 'Unavailable For Legal Reasons', // RFC 7725
	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', // RFC 2295
	507 => 'Insufficient Storage', // WebDAV; RFC 4918
	508 => 'Loop Detected', // WebDAV; RFC 5842
	510 => 'Not Extended', // RFC 2774
	511 => 'Network Authentication Required', // RFC 6585
	// and unofficially known https codes
	103 => 'Checkpoint',
	218 => 'This is fine', // Apache Web Server
	419 => 'Page Expired', // Laravel Framework
	420 => 'Method Failure', // Spring Framework
	420 => 'Enhance Your Calm', // Twitter
	430 => 'Request Header Fields Too Large', // Shopify
	450 => 'Blocked by Windows Parental Controls', // Microsoft
	498 => 'Invalid Token', // Esri
	499 => 'Token Required', // Esri
	509 => 'Bandwidth Limit Exceeded', // Apache Web Server/cPanel
	526 => 'Invalid SSL Certificate', // Cloudflare and Cloud Foundry's gorouter
	529 => 'Site is overloaded', // Qualys in the SSLLabs
	530 => 'Site is frozen', // Pantheon web platform
	598 => 'Network read timeout error', // Informal convention
	440 => 'Login Time-out', // IIS
	449 => 'Retry With', // IIS
	451 => 'Redirect', // IIS
	444 => 'No Response', // nginx
	494 => 'Request header too large', // nginx
	495 => 'SSL Certificate Error', // nginx
	496 => 'SSL Certificate Required', // nginx
	497 => 'HTTP Request Sent to HTTPS Port', // nginx
	499 => 'Client Closed Request', // nginx
	520 => 'Web Server Returned an Unknown Error', // Cloudflare
	521 => 'Web Server Is Down', // Cloudflare
	522 => 'Connection Timed Out', // Cloudflare
	523 => 'Origin Is Unreachable', // Cloudflare
	524 => 'A Timeout Occurred', // Cloudflare
	525 => 'SSL Handshake Failed', // Cloudflare
	526 => 'Invalid SSL Certificate', // Cloudflare
	527 => 'Railgun Error', // Cloudflare	
];

// ~~~ convert http code in descriptive text, which describes the code
function __HttpCode2Text($code) {
	global $http_status_code;
	if (isset($http_status_code[$code]))
		return $http_status_code[$code];
	return 0;
}

// ~~~ returns code, extracted from $var which must be following format: "HTTP/1.1 200 OK" , "HTTP/1.1 302 Found", "HTTP/1.0 301 Moved Permanently", etc
function __HttpStatusCode($var) {  
	if(preg_match( "#HTTP/[0-9\.]+\s+([0-9]+)#", $var , $result ))
		return intval($result[1]);
	else 
		return 0;
}

// ~~~ returns array with http version, response code, and message extracted from $var which must be following format: "HTTP/1.1 200 OK" , "HTTP/1.1 302 Found", "HTTP/1.0 301 Moved Permanently", etc
function __HttpStatusInfo($var) {
	if(preg_match( "#HTTP/([0-9\.]+\s+)([0-9]+) (.*)$#", $var , $result )) 
		return ['ver' => $result[1], 'code' => $result[2], 'message' => $result[3] ]; 
	else
		return [];
}