title: Is ctype_digit safe for post and get data integer validation in php?
body: <p>i want to know if <a href="http://br1.php.net/manual/pt_BR/function.ctype-digit.php" rel="nofollow">ctype_digit</a> is safe and enough for post and get data (user input) integer validation?</p>
  
  <p><strong>ctype_digit definition:</strong></p>
  
  <pre><code>  bool ctype_digit ( string $text )
    Checks if all of the characters in the provided string, text, are numerical.
  </code></pre>