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<!DOCTYPE html>
<html>
<body>
<?php
$str = "Hello";
echo md5($str);
if (md5($str) == "8b1a9953c4611296a827abf8c47804d7")
  {
  echo "<br>Hello world!";
  exit;
  }
?>
  
</body>
</html>
8b1a9953c4611296a827abf8c47804d7
Hello world!