Letters, numbers, and spaces only

[gorgo]

I want to verify that a string only contains letters, numbers, and spaces. How could I do this? Thanks.

[john-formby]

Something like:

 

preg_match('/^[a-z0-9]+$/i', $string)

 

[gevans]

<?php
function stringCheck($n){
   if(!ereg("^[a-zA-Z0-9 ]+$", $n)) return false;
   else return true;
}
?>