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Validate an alphanumeric string

/ Published in: PHP
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This function uses the preg_replace counter to check for any non-alphanumeric characters.

You can use this for username / password validation if you don't want any special characters to be used.

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  1. <?php			
  2.  
  3. 	function validate_alphanum($string)
  4. 	{
  5. 		$count = 0;
  6. 		preg_replace("/[^a-zA-Z0-9]/", "", $string, -1, $count);
  7.  
  8. 		if($count != 0)
  9. 		{
  10. 			return false;
  11. 		}
  12.  
  13. 		return true;
  14. 	}
  15.  
  16. ?>

URL: http://robert.im

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