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foreach后，什么也echo不出

WBOY
WBOYOriginal
2016-06-23 13:54:371072browse

<?php $_result2 = _query("SELECT * FROM dj");while (!!$_rows = _fetch_array_list($_result2)){ ?><tr><td><?php echo $_rows['bh'];?><input name="bh[]" type="hidden" value="<?php echo $_rows['bh'];?>"/></td></tr><?php$aa=$_POST['bh'];if (is_array($aa)){foreach ($aa as $bb){	echo $bb;}}}?>



为什么echo $bb，什么也没有？
是能显示出1，2，3，4……19，20，21的


回复讨论(解决方案)

已搞定！！！

$aa=$_POST['bh'];
post 提交后才会有值

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