<?php if (isset($_GET['user_name'])&&!empty($_GET['user_name'])) { $user_name = $_GET['user_name']; $user_name_lc = strtolower($user_name); if ($user_name_lc=='alex') { echo 'You are the best, '. $user_name; } } ?> <form action="index.php" method="GET"> Name: <input type="text" name="user_name"><br><br> <input type="Submit" value="Submit"> </form>
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