[harmor19]

let's say you had a form with the field
<input type="text" name="username" />


Use this code

PHP Code:

<?php
$names = array('Andrew', 'John', 'Mark');
if( in_array($_POST['username'], $names) )
{
    echo "Yes, my name is ".$_POST['username'].""; 
} 
else
{
   echo "No, my name is ".$_POST['username']."";
}
?>