Description:
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When I post an array and try do recover it I can?t do it. The result values doesn?t fetch the posted values.

Reproduce code:
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##form.php##
<form action=\"send.php\">
<input type=\"checkbox\" name=\"opt[]\" value=\"aaa\">
<input type=\"checkbox\" name=\"opt[]\" value=\"bbb\">
<input type=\"checkbox\" name=\"opt[]\" value=\"ccc\">
<input type=\"checkbox\" name=\"opt[]\" value=\"ddd\">
<input type=\"checkbox\" name=\"opt[]\" value=\"eee\">
<input type=\"submit\" value=\"Send\">

##send.php##
$vars = $_POST;
$opcoes = $vars['opt'];
echo "$opcoes[0]###$opcoes[1]###$opcoes[2]###$opcoes[3]###$opcoes[4]";

## The result should be "aaa###bbb###ccc###ddd###eee", but it prints "A###r###r###a###y" (the word "Array")

Expected result:
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aaa###bbb###ccc###ddd###eee

Actual result:
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A###r###r###a###y