> so it's simple, it's not an array, but your assignment magically makes it an array since you wrote "iterate over the array" ... very, very clear, isn't it?
OK, sarcasm a part, this works perfectly for me, and it's quite obvious Colors IS an array ...
<?php
if(isset($_POST['Colors']))
echo implode(',', $_POST['Colors'])
;
?>
<form method="POST" action="?">
<input type="checkbox" name="Colors[]" value="green" checked="checked" /> Green
<input type="checkbox" name="Colors[]" value="yellow" /> Yellow
<input type="checkbox" name="Colors[]" value="red" /> Red
<input type="checkbox" name="Colors[]" value="gray" /> Gray
<input type="submit" />
</form>
Regards
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