When I submit the for below it gives me an array that looks like this
"array(5) { [0]=> string(1) "3" [1]=> string(1) "4" [2]=> string(1) "5"
[3]=> string(1) "6" [4]=> string(1) "7" } "
I would like to convert it to a string like this "3,4,5,6,7"
<form action="test.php" method="post">
<table>
<tr><td colspan="2" align="left"><input name="subscriptions[]" value="3"
type="checkbox">test message
</td></tr><tr><td colspan="2" align="left"><input name="subscriptions[]"
value="4" type="checkbox">test message
</td></tr><tr><td colspan="2" align="left"><input name="subscriptions[]"
value="5" type="checkbox">test message
</td></tr><tr><td colspan="2" align="left"><input name="subscriptions[]"
value="6" type="checkbox">test message
</td></tr><tr><td colspan="2" align="left"><input name="subscriptions[]"
value="7" type="checkbox">test message
</td></tr>
</table>
<input type="hidden" name="doit" value="yes">
<input type="submit" name="submit">
</form>
