YA: Simple Phone Number Checking Mod2

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml…
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>Phone numbers</title>
        <meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
    </head>
<body>
    <?php
        $phoneNumbers = array("111-1111","(111) 111-1111","111-111-1111","111111",    "111.555.1234","","aaa-aaaa");

        foreach ($phoneNumbers as $phone) {
            $failures = 0;
            echo "<hr /><p>Checking '$phone'</p><hr />";

            $numNumbers = strlen(preg_replace('/[^0-9]/', '', $phone));

            if ( $numNumbers !== 7 && $numNumbers !== 10) {
                ++$failures;
                echo "<p><small>Warning: '$phone' must be 7 or 10 characters</small></p>";
            }

            if (preg_match("/[^0-9\(\)\-\s\.]+/",$phone)){
                ++$failures;
                echo "<p><small>Warning: '$phone' contains non-format characters</small></p>";
            }
            if ($failures == 0) {
                echo "<p>'$phone' is valid</p>";
            }else{
                echo "<p>'$phone' is not valid</p>";
            }
        }
    ?>
</body>
</html>