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
*/

function lnonly($string) {
$eregi = eregi_replace("([A-Z0-9]+)","",$string);
if(empty($eregi)){
return true;
}
return false;
}


// example usage:

/*
if(letters($yourstring)) {
echo "String Accepted";
}
else {
echo "String Rejected: <b>Bad Characters</b>";
}
*/
?>

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