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$str_tag = "";
$frm_tag = $_POST['frm_tag'];
for($i=0;$i<count($frm_tag);$i++)
{
echo $frm_tag[$i]."<br>";
if($i==0){
$str_tag = $frm_tag[$i];
}else{
$str_tag = $str_tag.",".$frm_tag[$i];
}
}
echo ($str_tag);
}

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<input type="checkbox" name="weeks[]" id="weeks" value=3>   
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<input type="checkbox" name="weeks[]" id="weeks" value=2>
<input type="checkbox" name="weeks[]" id="weeks" value=3>
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echo $str;  
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