A function to strip out alpha characters?

I have a field that requires only numbers on one of my forms. Is there a function that would strip out all letters and just leave the numbers?


[fphp]preg_replace[/fphp] would do it with an appropriate pattern. :slight_smile:

preg_replace('~[^0-9]~', null, $string);

I tried that and it didn’t work. I was still able to fill out the form with the following data:

123 E. Main

Shouldn’t the code snip that you provided reduced the string to:




See http://au.php.net/manual/en/filter.filters.sanitize.php for what filters are available to sanitize input data in PHP and see http://au.php.net/manual/en/filter.examples.sanitization.php for an example of how to code it.