HttpStatus.php

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<?php
class HttpStatus {
 
    private static $headersSentCallback = null;
 
    public static function registerHeadersSentCallback( callable $callback ): ?callable {
        $old = self::$headersSentCallback;
        self::$headersSentCallback = $callback;
 
        return $old;
    }
 
    public static function getMessage( $code ) {
        static $statusMessage = [
            100 => 'Continue',
            101 => 'Switching Protocols',
            102 => 'Processing',
            200 => 'OK',
            201 => 'Created',
            202 => 'Accepted',
            203 => 'Non-Authoritative Information',
            204 => 'No Content',
            205 => 'Reset Content',
            206 => 'Partial Content',
            207 => 'Multi-Status',
            300 => 'Multiple Choices',
            301 => 'Moved Permanently',
            302 => 'Found',
            303 => 'See Other',
            304 => 'Not Modified',
            305 => 'Use Proxy',
            307 => 'Temporary Redirect',
            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 Large',
            415 => 'Unsupported Media Type',
            416 => 'Request Range Not Satisfiable',
            417 => 'Expectation Failed',
            422 => 'Unprocessable Entity',
            423 => 'Locked',
            424 => 'Failed Dependency',
            428 => 'Precondition Required',
            429 => 'Too Many Requests',
            431 => 'Request Header Fields Too Large',
            500 => 'Internal Server Error',
            501 => 'Not Implemented',
            502 => 'Bad Gateway',
            503 => 'Service Unavailable',
            504 => 'Gateway Timeout',
            505 => 'HTTP Version Not Supported',
            507 => 'Insufficient Storage',
            511 => 'Network Authentication Required',
        ];
        return $statusMessage[$code] ?? null;
    }
 
    public static function getHeader( $code ): string {
        static $version = null;
        $message = self::getMessage( $code );
        if ( $message === null ) {
            throw new InvalidArgumentException( "Unknown HTTP status code $code" );
        }
 
        if ( $version === null ) {
            $version = isset( $_SERVER['SERVER_PROTOCOL'] ) &&
            $_SERVER['SERVER_PROTOCOL'] === 'HTTP/1.0' ?
                '1.0' :
                '1.1';
        }
 
        return "HTTP/$version $code $message";
    }
 
    public static function header( $code ) {
        if ( headers_sent() ) {
            if ( self::$headersSentCallback ) {
                ( self::$headersSentCallback )();
                return;
            }
 
            // NOTE: If there is no custom callback, we continue normally and
            //       rely on the implementation of header() to emit a warning.
        }
 
        try {
            header( self::getHeader( $code ) );
        } catch ( InvalidArgumentException $ex ) {
            trigger_error( "Unknown HTTP status code $code", E_USER_WARNING );
        }
    }
 
}