<?php

$necha = isset($_POST['son']) ? trim($_POST['son']) : ''; 





echo '<b>Parol qancha belgi bo\'lsin</b>? <select name="son">';

for ($i = 6; $i < 12; $i++) { 

echo '<option name="son" value="'.$i.'" '.($necha == $i ? ' selected="selected"' : '').'> '.$i.' </option>';  

}

?>

<form method=post>

<input type=text name=number value="'.$necha.'"?

<input type=submit value="yaratish">

<form>