PHP checkbox array checked

<form action="checkbox_array_checked.php" method="post">
<input type="checkbox" name="check[]" value="sakkarakati" <? if (in_array('sakkarakati', $_POST['check'])) { ?> checked="checked" <? }?>/> Sakkarakati<br>
<input type="checkbox" name="check[]" value="kuselan" <? if (in_array('kuselan', $_POST['check'])) { ?> checked="checked"<? }?> /> Kuselan<br>
<input type="checkbox" name="check[]" value="villu" <? if (in_array('villu', $_POST['check'])) { ?> checked="checked"<? }?> /> Villu<br>
</form>