/wp-content/plugins/si-captcha-for-wordpress/captcha/securimage_show.php

<?php



if ( isset($_GET['prefix']) && preg_match('/^[a-zA-Z0-9]{15,17}$/',$_GET['prefix']) ){

   // no session

   $prefix = $_GET['prefix'];



   include 'securimage.php';



   $char_length = 4;

   $chars = 'ABCDEFHKLMNPRSTUVWYZ234578';

   $chars_num = '234578'; // do not change this or the code will break!!

   // one random position always has to be a number so that a 4 letter swear word could never appear

   $rand_pos = mt_rand( 0, $char_length - 1 );

   $captcha_word  = '';

   for ( $i = 0; $i < $char_length; $i++ ) {

       // this rand character position is a number only so that a 4 letter swear word could never appear

       if($i == $rand_pos) {

              $pos = mt_rand( 0, strlen( $chars_num ) - 1 );

              $char = $chars_num[$pos];

       } else {

              $pos = mt_rand( 0, strlen( $chars ) - 1 );

              $char = $chars[$pos];

       }

	   $captcha_word .= $char;

   }



   $img = new securimage();

   $img->code_length = 4;



   $img->image_width   = 175;

   $img->image_height  = 60;



   if(isset($_GET['si_sm_captcha']) && $_GET['si_sm_captcha'] == 1) {

       $img->image_width   = 132;

	   $img->image_height  = 45;

   }



   //set some settings

   $img->nosession = true;

   $img->prefix = $prefix;

   $img->captcha_path = getcwd() . '/temp/';

   if(file_exists($img->captcha_path . $prefix . '.php') && is_readable( $img->captcha_path . $prefix . '.php' ) ) {

       include( $img->captcha_path . $prefix . '.php' );

       $img->captcha_word = $captcha_word;

   } else {

       $img->captcha_word = $captcha_word;

   }



   $img->use_multi_text = true;

   $img->use_transparent_text = true;

   $img->text_transparency_percentage = 20;

   $img->num_lines = 3;

   $img->perturbation = 0.6; // 1.0 = high distortion, higher numbers = more distortion

   $img->multi_text_color = array(

       '#6666FF','#660000','#3333CC','#993300','#0060CC',

       '#339900','#6633CC','#330000','#006666','#CC3366',

   );

  if (isset($_GET['difficulty']) && $_GET['difficulty'] == 1 ) {

    $img->perturbation = 0.5; // 1.0 = high distortion, higher numbers = more distortion

    $img->num_lines = 2;

    $img->multi_text_color = array('#6666FF','#660000','#3333CC','#993300','#0060CC');

  }

  if (isset($_GET['difficulty']) && $_GET['difficulty'] == 2 ) {

    $img->perturbation = 0.7; // 1.0 = high distortion, higher numbers = more distortion

    $img->num_lines = 6;

  }

  if (isset($_GET['no_trans']) && $_GET['no_trans'] == 1) {

     $img->use_transparent_text = false;

  }

   $img->charset = 'ABCDEFHKLMNPRSTUVWYZ234578';

   $img->ttf_file = getcwd() . '/ttffonts/ahg-bold.ttf';   // single font

   $img->line_color = new Securimage_Color(rand(0, 64), rand(64, 128), rand(128, 255));

   $img->image_type = 'png';

   $img->background_directory = getcwd() . '/backgrounds';

   $img->ttf_font_directory  = getcwd() . '/ttffonts';

   $img->show('');

   if(!file_exists($img->captcha_path . $prefix . '.php')) {

      if ( $fh = fopen( $img->captcha_path . $prefix . '.php', 'w' ) ) {

			fwrite( $fh, '<?php $captcha_word = \'' . $captcha_word . '\'; ?>' );

			fclose( $fh );

            @chmod( $img->captcha_path . $prefix . '.php', 0755 );

      }

   }

   unset($img);

   exit;

} else {

       // session

   include 'securimage.php';



   $img = new securimage();

   $img->code_length = 4;



   $img->image_width   = 175;

   $img->image_height  = 60;



   if(isset($_GET['si_sm_captcha']) && $_GET['si_sm_captcha'] == 1) {

       $img->image_width   = 132;

	   $img->image_height  = 45;

   }



   //set some settings

   if( isset($_GET['si_form_id']) && in_array($_GET['si_form_id'], array('com', 'reg', 'log')) ) {

            $img->form_id = $_GET['si_form_id'];

   }

   $img->use_multi_text = true;

   $img->use_transparent_text = true;

   $img->text_transparency_percentage = 20;

   $img->num_lines = 3;

   $img->perturbation = 0.6; // 1.0 = high distortion, higher numbers = more distortion

   $img->multi_text_color = array(

       '#6666FF','#660000','#3333CC','#993300','#0060CC',

       '#339900','#6633CC','#330000','#006666','#CC3366',

   );

  if (isset($_GET['difficulty']) && $_GET['difficulty'] == 1 ) {

    $img->perturbation = 0.5; // 1.0 = high distortion, higher numbers = more distortion

    $img->num_lines = 2;

    $img->multi_text_color = array('#6666FF','#660000','#3333CC','#993300','#0060CC');

  }

  if (isset($_GET['difficulty']) && $_GET['difficulty'] == 2 ) {

    $img->perturbation = 0.7; // 1.0 = high distortion, higher numbers = more distortion

    $img->num_lines = 6;

  }

  if (isset($_GET['no_trans']) && $_GET['no_trans'] == 1) {

     $img->use_transparent_text = false;

  }

   $img->charset = 'ABCDEFHKLMNPRSTUVWYZ234578';

   $img->ttf_file = getcwd() . '/ttffonts/ahg-bold.ttf';   // single font

   $img->line_color = new Securimage_Color(rand(0, 64), rand(64, 128), rand(128, 255));

   $img->image_type = 'png';

   $img->background_directory = getcwd() . '/backgrounds';

   $img->ttf_font_directory  = getcwd() . '/ttffonts';

   $img->show('');



   unset($img);

   exit;

}



?>