error checking of a variable's length and if its numeric

[jardane]

I have an input box for a zip code and i need error code to check if it contain 5 digits and contains only numbers.

[litebearer]

look here

 

http://roshanbh.com.np/2008/03/usa-zip-code-format-validation-php.html

[SaMike]

strlen returns string's length and is_numeric checks if its numeric (who knew, right?)

 

Example:

<?php
$string = "51245";
if(!is_numeric($string)) exit('Numbers only lol!');
if(strlen($string) != 5)) exit('5 numbers lol!');
?>