<?php

echo '<form method="post">
1 Is Equal By <input type="text" value="" name="number" size="10" />
<input type="submit" name="scan" value="submit" /></form>';

if (($number)==='1') {
    echo 'Yes, '.$number.' is equal to 1!';
} else {
    echo 'Not, '.$number.' is not equal to 1!';
}

?>