PHP - Allow only one particular word or any number

[jeffshead]

I am trying to edit a script to add some functionality.

I want to check a form input field and throw an error if it's blank or if it contains anything other than the word "Unlimited" or a number.

Here's a snippit but I know it's not correct:

PHP Code:

$use = $_POST['uses'];
if (!$edtErr) {
if ((!$use)||($use!="Unlimited")&&(!ctype_digit($use)) {                         
$edtErr = true;                  
} 


Anyone care to help me fix this

[kbluhm]

PHP Code:

$use = $_POST['uses'];

if ( 'Unlimited' != $use && ! ctype_digit( $use ) )
{
    $edtErr = TRUE;
} 


...or:

PHP Code:

$use = $_POST['uses'];

$edtErr = ( 'Unlimited' != $use && ! ctype_digit( $use ) ); 


[jeffshead]

Thanks kbluhm but that code actually did not work for me.

It would accept anything with a number in it.

I ended up using this:

PHP Code:

if ((!$use ) || ($use != 'unlimited') && (!preg_match("/^\d+$/",$use )) ) {