How can I check a value entered in a field on my form is a number?
By Abhijit Paul
How can I check a value entered in a field on my form is a number?????
Teacher SiliconIndia replied to Abhijit Paul Wednesday, March 17, 2010
Hi Abhijit,
There are several ways that you can check that this is the case. One of the simplest ways is to use a dedicated function, is_numeric - just pass it the value and it'll return true or false depending on whether it is a number or not.
Here's an example:
<?php
$formvalue = "57a";
if(is_numeric($formvalue)) { echo "Is a number"; } else { echo "Not a number"; }
?>
This prints 'Not a number' in this instance.
