In PHP,How can I check that a data value is alphanumeric ?

Answer 1

You can easily validate with the help of ctype_alpha function.
<?php $formvalue = "am I alphanumeric or not"; if(ctype_alpha($formvalue)) { echo "Yes I am!"; } else { echo "No I'm not!"; } ?>

In this case printing "No I'm not!" because $formvalue contains spaces.