Don't complicate your code if you don't need it. IF you need to find out the length of the string, use PHP's built-in functions. They're faster and they are easier to write, debug and for others to understand. If I missed your point completely, forgive me.
And here's the code for you do figure out your problem.
if (strlen($string) > 20){
print "error";
} else {
print "OK";
}
Adam
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