Anvery simple and easy to use function to test if a string contains only letters and numbers.
By : mrbiiggy
<?php /* lnonly stands for letters & numbers only..
this is just a little quick function to test if a string contains only letters and numbers... the only alternative function to this i've found must be built into php when compiling.. i like this a lot better and its comes in handy when checking entries on forms.. -mrb */
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