public static function getHeader($header) {

		$headers = static :: getHeaders();

		if(true === isset($headers[$header])) {
			return $headers[$header];
		}

		return null;
	}
public static function getHeader($header) {

		$headers = static :: getHeaders();

		if(true === isset($headers[$header])) {
			return $headers[$header];
		}

		return null;
	}
public static function getHeader ( $ header ) { $ headers = static :: getHeaders ( ) ; if ( true === isset ( $ headers [ $ header ] ) ) { return $ headers [ $ header ] ; } return null ; }
Get request header by key
@param string $header
@return string
Get request header by key