captcha.php

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<?php

      /*
      *     This source code is a part of the Ultimix Project. 
      *     It is distributed under BSD license. All other third side source code (like tinyMCE) is distributed under 
      *     it's own license wich could be found from the corresponding files or sources. 
      *     This source code is provided "as is" without any warranties or garanties.
      *
      *     Have a nice day!
      *
      *     @url http://ultimix.sorceforge.net
      *
      *     @author Alexey "gdever" Dodonov
      */

      /*
      *     w3captcha - php-ñêðèïò äëÿ ãåíåðàöèè èçîáðàæåíèé CAPTCHA
      *     âåðñèÿ: 1.0 îò 01.02.2008
      *     ðàçðàáîò÷èêè: http://w3box.ru
      *     òèï ëèöåíçèè: freeware
      *     w3box.ru © 2008
      */

      class captcha_1_0_0{

            var                           $Security = false;
            
            var                           $Chars = false;

            function                __construct()
            {
                  try
                  {
                        $this->Security = get_package( 'security' , 'last' , __FILE__ );
                        $this->Chars = '0123456789';
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }

            function                prepare_image()
            {
                  try
                  {
                        $Width = 100; /* øèðèíà êàðòèíêè */
                        $Height = 30; /* âûñîòà êàðòèíêè */
                        $Image = imagecreatetruecolor( $Width , $Height );

                        $BackgroundColor = imagecolorallocate( $Image , 255 , 255 , 255 ); /* rbg-öâåò ôîíà */

                        imagefill( $Image , 0 , 0 , $BackgroundColor);

                        return( $Image );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }

            function                get_font_settings( $Image )
            {
                  try
                  {
                        $FontFile = dirname( __FILE__ ).'/res/font/albonic.ttf'; /* ïóòü ê ôàéëó îòíîñèòåëüíî w3captcha.php */
                        $CharAlign = 22; /* âûðàâíèâàíèå ñèìâîëà ïî-âåðòèêàëè */
                        $Start = 5; /* ïîçèöèÿ ïåðâîãî ñèìâîëà ïî-ãîðèçîíòàëè */
                        $Interval = 16; /* èíòåðâàë ìåæäó íà÷àëàìè ñèìâîëîâ */
                        $Color = imagecolorallocate( $Image , 255 , 0 , 0 ); /* rbg-öâåò òåíè */
                        $NumChars = strlen( $this->Chars );

                        return( array( $FontFile , $CharAlign , $Start , $Interval , $Color , $NumChars ) );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }

            function                create_captcha( &$Options )
            {
                  try
                  {
                        $Image = $this->prepare_image();
                        $Str = "";

                        list( $FontFile , $Align , $Start , $Interval , $Color , $Count ) = $this->get_font_settings( $Image );

                        for( $i = 0 ; $i < 5 ; $i++ )
                        {
                              $Char = $this->Chars[ rand( 0 , $Count - 1 ) ];
                              $FontSize = rand( 15 , 25 );
                              $CharAngle = rand( -10 , 10 );
                              imagettftext( 
                                    $Image , $FontSize , $CharAngle , $Start , $Align , $Color , $FontFile , $Char
                              );
                              $Start += $Interval;
                              $Str .= $Char;
                        }

                        return( array( $Image , $Str ) );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }

            function                get_sesion_name( &$Options )
            {
                  try
                  {
                        $SessionName = 'captcha';

                        if( $Options->get_setting( 'captcha_name' , false ) !== false )
                        {
                              if( $Options->get_setting( 'captcha_name' ) == 'auto' )
                              {
                                    $SessionName = $Options->get_setting( 'captcha_name' );
                              }
                              else
                              {
                                    $SessionName = md5( 
                                          $this->Security->get_srv( 'SCRIPT_NAME' , 'string' ).
                                          $this->Security->get_srv( 'QUERY_STRING' , 'string' )
                                    );
                              }
                        }

                        return( $SessionName );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }

            function                validate_captcha( $InputCaptcha , $Options )
            {
                  try
                  {
                        return( @$_SESSION[ $this->get_sesion_name( $Options ) ] == $InputCaptcha );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }

            function                output_image( &$Image )
            {
                  try
                  {
                        if( function_exists( "imagepng" ) )
                        {
                              header( "Content-type: image/png" );
                              imagepng( $Image );
                        }
                        elseif( function_exists( "imagegif" ) )
                        {
                              header( "Content-type: image/gif" );
                              imagegif( $Image );
                        }
                        elseif( function_exists( "imagejpeg" ) )
                        {
                              header( "Content-type: image/jpeg" );
                              imagejpeg( $Image );
                        }

                        imagedestroy( $Image ); 
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }

            function                view( $Options )
            {
                  try
                  {
                        @session_start();

                        list( $Image , $Str ) = $this->create_captcha( $Options );

                        $_SESSION[ $this->get_sesion_name( $Options ) ] = $Str;

                        $this->output_image( $Image );

                        return( '' );
                  }
                  catch( Exception $e )
                  {
                        $a = func_get_args();_throw_exception_object( __METHOD__ , $a , $e );
                  }
            }
      }

?>