如何在关联数组中搜索数组值并返回键[重复]

Question

<?php Array (
[2] =>
 Array ( [0] => cheap [1] => computer [2] => three ) 
[6] =>
 Array ( [0] => laptop [1] => phone [2] => car )
 ) ?>

我正在寻找一段时间来搜索“便宜”并获得 2。指针表示赞赏。

Answer 1

$arr = Array ( [2] => Array ( [0] => cheap [1] => computer [2] => three ) 
               [6] => Array ( [0] => laptop [1] => phone [2] => car ) )

foreach($arr as $key=>$value){
   if(in_array("cheap", $value)){
      echo $key;
   }

}