数组用下标回重组数组，为什么重组出来的数组下标一直是第一个

<br /><?php<br />$id = array(8,31,32);<br /><br />$resarr = array();<br />foreach($id as $num)<br />{<br />	$product = array(<br />					array(<br />						'pid'=>'10', <br />						'name'=>'产品1'<br />						),<br />					array(<br />						'pid'=>'11', <br />						'name'=>'产品2'<br />						)<br />					);<br />	foreach($product as $key => $value)<br />	{<br />		$result_value = "";<br />		foreach($value as $k => $v)<br />		{<br />			$result_value .= $result_value ? "|" : "";<br />			$result_value .=  $v['pid'];<br />		}<br />		$product[$key]['value'] = $result_value;<br />	}<br />	$resarr[$num] = $product;<br />	var_dump($resarr);<br />	echo "<hr />";<br />}<br />

$id = array(8,31,32);<br /><br />$resarr = array();<br />foreach($id as $num)<br />{<br />	$product = array(<br />					array(<br />						'pid'=>'10', <br />						'name'=>'产品1'<br />						),<br />					array(<br />						'pid'=>'11', <br />						'name'=>'产品2'<br />						)<br />					);<br />	foreach($product as $key => $value)<br />	{<br />		$result_value = "";<br />		foreach($value as $k => $v)<br />		{<br />			$result_value .= $result_value ? "<br><font color='#FF8000'>------解决方案--------------------</font><br>" : "";<br />			$result_value .=  $v['pid'];<br />		}<br />		$product[$key]['value'] = $result_value;<br />	}<br />	$resarr[$num] = $product;<br />	<br />}<br />var_dump($resarr);<br />echo "<hr />";