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  1. <?php
  2.  
  3. class TextToAscii
  4. {
  5.     private static $charsMap = array(
  6.         ' ' => array(
  7.             ' ',
  8.             ' ',
  9.             ' ',
  10.             ' ',
  11.             ' ',
  12.         ),
  13.         '0' => array(
  14.             '###',
  15.             '# #',
  16.             '# #',
  17.             '# #',
  18.             '###',
  19.         ),
  20.         '1' => array(
  21.             '## ',
  22.             ' # ',
  23.             ' # ',
  24.             ' # ',
  25.             '###',
  26.         ),
  27.         '2' => array(
  28.             '###',
  29.             '  #',
  30.             '###',
  31.             '#  ',
  32.             '###',
  33.         ),
  34.         '3' => array(
  35.             '###',
  36.             '  #',
  37.             '###',
  38.             '  #',
  39.             '###',
  40.         ),
  41.         '4' => array(
  42.             '# #',
  43.             '# #',
  44.             '###',
  45.             '  #',
  46.             '  #',
  47.         ),
  48.         '5' => array(
  49.             '###',
  50.             '#  ',
  51.             '###',
  52.             '  #',
  53.             '###',
  54.         ),
  55.         '6' => array(
  56.             '###',
  57.             '#  ',
  58.             '###',
  59.             '# #',
  60.             '###',
  61.         ),
  62.         '7' => array(
  63.             '###',
  64.             '  #',
  65.             '  #',
  66.             '  #',
  67.             '  #',
  68.         ),
  69.         '8' => array(
  70.             '###',
  71.             '# #',
  72.             '###',
  73.             '# #',
  74.             '###',
  75.         ),
  76.         '9' => array(
  77.             '###',
  78.             '# #',
  79.             '###',
  80.             '  #',
  81.             '###',
  82.         ),
  83.         '+' => array(
  84.             '   ',
  85.             ' # ',
  86.             '###',
  87.             ' # ',
  88.             '   ',
  89.         ),
  90.         '-' => array(
  91.             '   ',
  92.             '   ',
  93.             '###',
  94.             '   ',
  95.             '   ',
  96.         ),
  97.         '=' => array(
  98.             '   ',
  99.             '###',
  100.             '   ',
  101.             '###',
  102.             '   ',
  103.         ),
  104.         '?' => array(
  105.             '###',
  106.             '  #',
  107.             ' # ',
  108.             '   ',
  109.             ' # ',
  110.         ),
  111.     );
  112.  
  113.     private static $textChars = array('@', '#', '$', '&');
  114.  
  115.     public static function render($text)
  116.     {
  117.         $image = array(
  118.             '',
  119.             '',
  120.             '',
  121.             '',
  122.             '',
  123.             '',
  124.         );
  125.  
  126.         foreach (str_split($text) as $char) {
  127.             if (!isset(self::$charsMap[$char])) {
  128.                 trigger_error('This character is not supported: '. $char, E_USER_WARNING);
  129.                 return '/* CAPTCHA ERROR */';
  130.             }
  131.  
  132.             $textChar =& self::$textChars[ array_rand(self::$textChars) ];
  133.  
  134.             $shift = mt_rand(0, 1);
  135.             $emptyImageLine = str_repeat(' ', strlen(self::$charsMap[$char][0]));
  136.  
  137.             foreach ($image as $imageLineNumber => &$imageLine) {
  138.                 $lineNumber = $imageLineNumber-$shift;
  139.  
  140.                 if (isset(self::$charsMap[$char][$lineNumber])) {
  141.                     $imageLine .= str_replace(
  142.                         '#',
  143.                         $textChar,
  144.                         self::$charsMap[$char][$lineNumber]
  145.                     );
  146.                 } else {
  147.                     $imageLine .= $emptyImageLine;
  148.                 }
  149.             }
  150.         }
  151.  
  152.         $image = implode("\n", $image);
  153.  
  154.         return $image;
  155.     }
  156. }
  157.  
  158. echo TextToAscii::render('3 + 7 - 4');
Success #stdin #stdout 0.01s 20568KB
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Standard input is empty
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###     ###     $ $
  #  @    #     $ $
### @@@   # &&& $$$
  #  @    #       $
###       #       $
https://ideone.com/7RSF7x
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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