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<form action=test2.php method=post>
<input type="checkbox" name="newsletter[]" value="1" id="newsleter_item_1">
<label for="newsleter_item_1">newsletter</label>
<input type="checkbox" name="newsletter[]" value="2" id="newsleter_item_2">
<label for="newsleter_item_2">newsletter</label>
<input type="checkbox" name="newsletter[]" value="3" id="newsleter_item_3">
<label for="newsleter_item_3">newsletter</label>
<input type="checkbox" name="newsletter[]" value="4" id="newsleter_item_4">
<label for="newsleter_item_4">newsletter</label>
<input type="checkbox" name="newsletter[]" value="5" id="newsleter_item_5">
<label for="newsleter_item_5">newsletter</label>
<input type="checkbox" name="newsletter[]" value="6" id="newsleter_item_6">
<label for="newsleter_item_6">newsletter</label>
<input type=submit>
</form>
<?php
print_r($_POST);
$cb="";
if(isset($_POST['newsletter'])){
foreach($_POST['newsletter'] as $chkbx){
$cb.= $chkbx;
}
}
echo $cb;
?>