PHP Developers Network

Summary: when i create a series of checkboxes using php, I cannot check if there is at least one checked or not.

and full story: in a script like bellow:
<?
echo "<form name=myform method=post action=test2.php>";
for ($i=0; $i<10; $i++)
{
echo "<input type=checkbox name=mycheckbox[] value=$i><br>";
}
echo "<input type=button onclick='myfunction()'>";
echo "</form>";
?>
if I dont' put [] in front of name attribute i wont be able to send values to the other page (test2.php). and if i put square brackets i cannot find the length of check boxes in my javascript function.

so how do I check if there is at least one checkbox is checked before submitting the form?