<?php
  header("Content-type: text/plain");

  # Returns true if $str contains two or more occurrences of $ch, otherwise false.
  # Ignores case when comparing $ch, so 'l' is considered the same as 'L'. For example,
  # containsTwice("helLo", "l") returns true, but containsTwice("helLo", "e") returns false.
  function containsTwice($str, $ch) {
    $count = 0;
    $str = strtolower($str);
    for ($i = 0; $i < strlen($str); $i++) {
      if ($str[$i] == $ch) {
        $count++;
       }
     }
     return $count >= 2;
  }

  $str = "helLo";
  $ch = "l";
  $result = containsTwice($str, $ch);

  # have to convert booleans to true/false strings, otherwise 1 is output for true, and nothing
  # is output for false. blep. 

  $result = $result ? "true" : "false";
  print "$str contains {$ch} twice: $result\n";
  $ch = "e";
  $result = containsTwice($str, $ch);
  $result = $result ? "true" : "false";
  print "$str contains {$ch} twice: $result\n";
?>