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<form action="" method="post">

<p>?? ??? ?????: <input type='text' name='v1'>

<?php

session_start (); //?? ??

$input = array_merge(range('a', 'z'),range('A', 'Z'),range('0', '9')) / / ?? ?? ?? ??

shuffle($input); //?? ??

$result = '' //?? ?? ?? ???

for ($i=0; $i < 4 ; $i++ ) { //?? 4?? ?? ??? ???????

$result .= $input[$i]; //??? ?? ?? ??? ?????

}

echo $result; $_SESSION['Result'] = $result; //???? ??? ??? ??

// setcookie(session_name(),session_id(),time()+30)

if (isset( $_REQUEST['v1'] )) { //?? ??? ?? ??? ??

if (strtoupper($_REQUEST['v1']) == strtoupper($_SESSION['Result'])) { // ????? ??? ?????

echo "<script>alert('????? ?????. ??? ??!!')</script>"

unset($_SESSION['Result']);