function checkBrowserOpera() {
    if ( stripos( $this->_agent, 'opera mini' ) !== false ) {
      $resultant = stristr( $this->_agent, 'opera mini' );
      if ( preg_match( '/\//', $resultant ) ) {
        $aresult = explode( '/', $resultant );
        $aversion = explode( ' ', $aresult[1] );
        $this->setVersion( $aversion[0] );
      } else {
        $aversion = explode( ' ', stristr( $resultant, 'opera mini' ) );
        $this->setVersion( $aversion[1] );
      }
      $this->_browser_name = $this->BROWSER_OPERA_MINI;
      $this->setMobile( true );
      return true;
    } else if ( stripos( $this->_agent, 'opera' ) !== false ) {
      $resultant = stristr( $this->_agent, 'opera' );
      if ( preg_match( '/Version\/(10.*)$/', $resultant, $matches ) ) {
        $this->setVersion( $matches[1] );
      } else if ( preg_match( '/\//', $resultant ) ) {
        $aresult = explode( '/', str_replace( "(", " ", $resultant ) );
        $aversion = explode( ' ', $aresult[1] );
        $this->setVersion( $aversion[0] );
      } else {
        $aversion = explode( ' ', stristr( $resultant, 'opera' ) );
        $this->setVersion( isset( $aversion[1] )?$aversion[1]:"" );
      }
      $this->_browser_name = $this->BROWSER_OPERA;
      return true;
    }
    return false;
  }