这种情况FOREACH如何用

这种情况FOREACH怎么用

 foreach($str as $key=>$row)

	     {

		   if(preg_match_all('/\b[Nn][Ss][Kk]-\w{5}/',$sn,$match)){

	       $str[$key]['darfon_pn']=substr_replace($match[0][0],$row['darfon_pn'],7,2);

		   }else{

		   $str[$key]['darfon_pn'] = '';

		   }

         }

以上代码只遍历了$match[0][0]，如何才能遍历整个$match每个值

------解决方案--------------------
最初的 $str[$key]['darfon_pn'] 的内容是什么？
测试代码

$sn = 'NSK-34582 NSK-UUS89 NSK-89234';

preg_match_all('/\b[Nn][Ss][Kk]-\w{5}/',$sn,$match);

print_r($match[0]);

$str = '________';

foreach($match[0] as $v) {

  $str = substr_replace($v, $str,7,2);

  echo $str,PHP_EOL;

}

Array
(
[0] => NSK-34582
[1] => NSK-UUS89
[2] => NSK-89234
)
NSK-345________
NSK-UUSNSK-345________
NSK-892NSK-UUSNSK-345________

是你期望的吗？