php validate integer

Question

I`m wonder why this not working

    echo gettype($_GET[\'id\']); //returns string
  if(is_int($_GET[\'id\']))
  {
   echo \'Integer\';
  }

Answer 1

It sounds like you are checking if a string contains an integer, rather than if that variable is an integer. If so, you should check out php's regex (regular expression) functionality. It allows you to check for very specific patterns in a string to validate it for whatever criteria. (such as if it contains only number characters)

Here's the php page http://php.net/manual/en/function.preg-match.php

and here's a cheat sheet on regular expressions (to make the $pattern string) http://regexpr.com/cheatsheet/