public function is($characteristic)
    {
        switch ( strtolower($characteristic) ) {
            case "ajax":
                return ( 
                    isset($this->_env['HTTP_X_REQUESTED_WITH']) &&
                    $this->_env['HTTP_X_REQUESTED_WITH'] == "XMLHttpRequest"
                );
            case "delete":
                return ( $this->method == "DELETE" );
            case "flash":
                return (
                    $this->_env['HTTP_USER_AGENT'] == "Shockwave Flash"
                );
            case "get":
                return ( $this->method == "GET" );
            case "head":
                return ( $this->method == "HEAD" );
            case "mobile":
                $mobile_user_agents = array(
                    "Android", "AvantGo", "Blackberry", "DoCoMo", "iPod",
                    "iPhone", "J2ME", "NetFront", "Nokia", "MIDP", "Opera Mini",
                    "PalmOS", "PalmSource", "Plucker", "portalmmm",
                    "ReqwirelessWeb", "SonyEricsson", "Symbian", "UP\.Browser",
                    "Windows CE", "Xiino"
                );
                $pattern = "/" . implode("|", $mobile_user_agents) . "/i";
                return (boolean) preg_match(
                    $pattern, $this->_env['HTTP_USER_AGENT']
                );
            case "options":
                return ( $this->method == "OPTIONS" );
            case "post":
                return ( $this->method == "POST" );
            case "put":
                return ( $this->method == "PUT" );
            case "ssl":
                return $this->_env['HTTPS'];
            default:
                return false;
        }
    }
public function is($characteristic)
    {
        switch ( strtolower($characteristic) ) {
            case "ajax":
                return ( 
                    isset($this->_env['HTTP_X_REQUESTED_WITH']) &&
                    $this->_env['HTTP_X_REQUESTED_WITH'] == "XMLHttpRequest"
                );
            case "delete":
                return ( $this->method == "DELETE" );
            case "flash":
                return (
                    $this->_env['HTTP_USER_AGENT'] == "Shockwave Flash"
                );
            case "get":
                return ( $this->method == "GET" );
            case "head":
                return ( $this->method == "HEAD" );
            case "mobile":
                $mobile_user_agents = array(
                    "Android", "AvantGo", "Blackberry", "DoCoMo", "iPod",
                    "iPhone", "J2ME", "NetFront", "Nokia", "MIDP", "Opera Mini",
                    "PalmOS", "PalmSource", "Plucker", "portalmmm",
                    "ReqwirelessWeb", "SonyEricsson", "Symbian", "UP\.Browser",
                    "Windows CE", "Xiino"
                );
                $pattern = "/" . implode("|", $mobile_user_agents) . "/i";
                return (boolean) preg_match(
                    $pattern, $this->_env['HTTP_USER_AGENT']
                );
            case "options":
                return ( $this->method == "OPTIONS" );
            case "post":
                return ( $this->method == "POST" );
            case "put":
                return ( $this->method == "PUT" );
            case "ssl":
                return $this->_env['HTTPS'];
            default:
                return false;
        }
    }
public function is ( $ characteristic ) { switch ( strtolower ( $ characteristic ) ) { case "ajax" : return ( isset ( $ this -> _env [ 'HTTP_X_REQUESTED_WITH' ] ) && $ this -> _env [ 'HTTP_X_REQUESTED_WITH' ] == "XMLHttpRequest" ) ; case "delete" : return ( $ this -> method == "DELETE" ) ; case "flash" : return ( $ this -> _env [ 'HTTP_USER_AGENT' ] == "Shockwave Flash" ) ; case "get" : return ( $ this -> method == "GET" ) ; case "head" : return ( $ this -> method == "HEAD" ) ; case "mobile" : $ mobile_user_agents = array ( "Android" , "AvantGo" , "Blackberry" , "DoCoMo" , "iPod" , "iPhone" , "J2ME" , "NetFront" , "Nokia" , "MIDP" , "Opera Mini" , "PalmOS" , "PalmSource" , "Plucker" , "portalmmm" , "ReqwirelessWeb" , "SonyEricsson" , "Symbian" , "UP\.Browser" , "Windows CE" , "Xiino" ) ; $ pattern = "/" . implode ( "|" , $ mobile_user_agents ) . "/i" ; return ( boolean ) preg_match ( $ pattern , $ this -> _env [ 'HTTP_USER_AGENT' ] ) ; case "options" : return ( $ this -> method == "OPTIONS" ) ; case "post" : return ( $ this -> method == "POST" ) ; case "put" : return ( $ this -> method == "PUT" ) ; case "ssl" : return $ this -> _env [ 'HTTPS' ] ; default : return false ; } }
Checks for request characteristics.

The full list of request characteristics is as follows:

* "ajax" - XHR
* "delete" - DELETE REQUEST_METHOD
* "flash" - "Shockwave Flash" HTTP_USER_AGENT
* "get" - GET REQUEST_METHOD
* "head" - HEAD REQUEST_METHOD
* "mobile"  - any one of the following HTTP_USER_AGENTS:

1. "Android"
1. "AvantGo"
1. "Blackberry"
1. "DoCoMo"
1. "iPod"
1. "iPhone"
1. "J2ME"
1. "NetFront"
1. "Nokia"
1. "MIDP"
1. "Opera Mini"
1. "PalmOS"
1. "PalmSource"
1. "Plucker"
1. "portalmmm"
1. "ReqwirelessWeb"
1. "SonyEricsson"
1. "Symbian"
1. "UP.Browser"
1. "Windows CE"
1. "Xiino"

* "options" - OPTIONS REQUEST_METHOD
* "post"    - POST REQUEST_METHOD
* "put"     - PUT REQUEST_METHOD
* "ssl"     - HTTPS

@access public
@param string $characteristic    The characteristic.
@return bool
Checks for request characteristics .