How can I check a value entered in a field on my form is a number?

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.

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How can I check a value entered in a field on my form is a number?

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