private function isMSIE()
  {
    $is = false;
    // Versions prior to IE11 follow this format
    if ( preg_match("/MSIE (([0-9]+)\.?([0-9]*))/", $this->ua, $matches) )
    {
      $is = true;
      $version = $matches[ 1 ];
      $major = $matches[ 2 ];
      $minor = $matches[ 3 ];
    }
    // This one is for IE11 only.
    elseif ( preg_match( "/Trident\/[0-9]\.[0-9]; [^;]*[;\s]*rv:(([0-9]+)\.?([0-9]*))/", $this->ua, $matches ) )
    {
      $is = true;
      $version = $matches[ 1 ];
      $major = $matches[ 2 ];
      $minor = $matches[ 3 ];
    }

    // Excludes 'bots' that might be acting like MSIE.
    if ( $is && isset($version,$major,$minor) && stripos($this->ua,'bot') === false)
    {
      $this->browser = "msie";
      $this->version = $version;
      $this->major = $major;
      $this->minor = $minor;

      return true;
    }

    return false;
  }
private function isMSIE()
  {
    $is = false;
    // Versions prior to IE11 follow this format
    if ( preg_match("/MSIE (([0-9]+)\.?([0-9]*))/", $this->ua, $matches) )
    {
      $is = true;
      $version = $matches[ 1 ];
      $major = $matches[ 2 ];
      $minor = $matches[ 3 ];
    }
    // This one is for IE11 only.
    elseif ( preg_match( "/Trident\/[0-9]\.[0-9]; [^;]*[;\s]*rv:(([0-9]+)\.?([0-9]*))/", $this->ua, $matches ) )
    {
      $is = true;
      $version = $matches[ 1 ];
      $major = $matches[ 2 ];
      $minor = $matches[ 3 ];
    }

    // Excludes 'bots' that might be acting like MSIE.
    if ( $is && isset($version,$major,$minor) && stripos($this->ua,'bot') === false)
    {
      $this->browser = "msie";
      $this->version = $version;
      $this->major = $major;
      $this->minor = $minor;

      return true;
    }

    return false;
  }
private function isMSIE ( ) { $ is = false ; // Versions prior to IE11 follow this format if ( preg_match ( "/MSIE (([0-9]+)\.?([0-9]*))/" , $ this -> ua , $ matches ) ) { $ is = true ; $ version = $ matches [ 1 ] ; $ major = $ matches [ 2 ] ; $ minor = $ matches [ 3 ] ; } // This one is for IE11 only. elseif ( preg_match ( "/Trident\/[0-9]\.[0-9]; [^;]*[;\s]*rv:(([0-9]+)\.?([0-9]*))/" , $ this -> ua , $ matches ) ) { $ is = true ; $ version = $ matches [ 1 ] ; $ major = $ matches [ 2 ] ; $ minor = $ matches [ 3 ] ; } // Excludes 'bots' that might be acting like MSIE. if ( $ is && isset ( $ version , $ major , $ minor ) && stripos ( $ this -> ua , 'bot' ) === false ) { $ this -> browser = "msie" ; $ this -> version = $ version ; $ this -> major = $ major ; $ this -> minor = $ minor ; return true ; } return false ; }
Determines if a browser is Internet Explorer by the user agent string.

@return bool
Determines if a browser is Internet Explorer by the user agent string .