message.php

<?php
  // This is the class to generate mp3 files based on the anti-spam words
  // Based on the PHP mp3 class at http://www.sourcerally.net/Scripts/20-PHP-MP3-Class
  // Output code based on the FPDF class at http://www.fpdf.org
  class mp3
  {
      var $str;
      var $time;
      var $frames;
      
      // Create a new mp3
      function mp3($path = "")
      {
          if ($path != "") {
              $this->str = file_get_contents($path);
          }
      }
      
      // Put an mp3 behind the first mp3
      function mergeBehind($mp3)
      {
          $this->str .= $mp3->str;
      }
      
      // Calculate where's the end of the sound file
      function getIdvEnd()
      {
          $strlen = strlen($this->str);
          $str = substr($this->str, ($strlen - 128));
          $str1 = substr($str, 0, 3);
          if (strtolower($str1) == strtolower('TAG')) {
              return $str;
          } else {
              return false;
          }
      }
      
      // Calculate where's the beginning of the sound file
      function getStart()
      {
          $strlen = strlen($this->str);
          for ($i = 0; $i < $strlen; $i++) {
              $v = substr($this->str, $i, 1);
              $value = ord($v);
              if ($value == 255) {
                  return $i;
              }
          }
      }
      
      // Remove the ID3 tags
      function striptags()
      {
          //Remove start stuff...
          $newStr = '';
          $s = $start = $this->getStart();
          if ($s === false) {
              return false;
          } else {
              $this->str = substr($this->str, $start);
          }
          //Remove end tag stuff
          $end = $this->getIdvEnd();
          if ($end !== false) {
              $this->str = substr($this->str, 0, (strlen($this->str) - 129));
          }
      }
      
      // Display an error
      function error($msg)
      {
          //Fatal error
          die('<strong>audio file error: </strong>' . $msg);
      }
      
      // Send the new mp3 to the browser
      function output($path)
      {
          //Output mp3
          //Send to standard output
          if (ob_get_contents())
              $this->error('Some data has already been output, can\'t send mp3 file');
          if (php_sapi_name() != 'cli') {
              //We send to a browser
              header('Content-Type: audio/mpeg3');
              if (headers_sent())
                  $this->error('Some data has already been output to browser, can\'t send mp3 file');
              header('Content-Length: ' . strlen($this->str));
              header('Content-Disposition: attachment; filename="' . $path . '"');
          }
          echo $this->str;
          return '';
      }
  }
  
  // Specify the word
  $word = "1579";
  $word = "a" . $_POST['number'] . "b" . $_POST['opt1'] . "f" . $_POST['opt2'] . $_POST['beeps'];
  
  $word_count = strlen($word);
  
  // Set up the first file
  if ($word_count > 0) {
      $mp3 = new mp3($cas_fontpath . './snippets/' . substr($word, 0, 1) . '.mp3');
      $mp3->striptags();
  }
  
  // Generate the mp3 file from each letter in the word
  for ($i = 1; $i < $word_count; ++$i) {
      $cas_character = $cas_fontpath . 'snippets/' . substr($word, $i, 1);
      $cas_mp3equivalent = new mp3($cas_character . '.mp3');
      $mp3->mergeBehind($cas_mp3equivalent);
      $mp3->striptags();
  }
  
  // Spit out the audio file!
  $mp3->output('message.mp3');