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$str_tag = "";
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{
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if($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=2>   
<input type="checkbox" name="weeks[]" id="weeks" value=3>   
<input type="checkbox" name="weeks[]" id="weeks" value=1>
<input type="checkbox" name="weeks[]" id="weeks" value=2>
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$str =implode(',',$array);   
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* Author : Fanglor
* Email : Fanlor@163.com
* Url : www.skyleft.com
* Date : 2009-10-13
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