检查PHP多维数组中是否存在数组值

我有以下多维数组：

Array ( [0] => Array 
         ( [id] => 1 
           [name] => Jonah 
           [points] => 27 )
        [1] => Array 
         ( [id] => 2 
           [name] => Mark 
           [points] => 34 )
      )

我目前正在使用

foreach

循环从数组中提取值：

foreach ($result as $key => $sub)
{
    ...
}

但我想知道如何查看数组中的值是否已经存在

例如，如果我想向数组中添加另一个集合，但id是

1

（因此此人是Jonah）并且他们的分数是5，我可以将5添加到

ID0

中已经创建的数组值中，而不是创建新的数组值吗

因此，循环完成后，数组将如下所示：

Array ( [0] => Array 
         ( [id] => 1 
           [name] => Jonah 
           [points] => 32 )
        [1] => Array 
         ( [id] => 2 
           [name] => Mark 
           [points] => 34 )
      )

---

在数组上循环，检查每个项目是否是您要查找的

id

$found = false;
foreach ($your_array as $key => $data) {
    if ($data['id'] == $the_id_youre_lloking_for) {
        // The item has been found => add the new points to the existing ones
        $data['points'] += $the_number_of_points;
        $found = true;
        break; // no need to loop anymore, as we have found the item => exit the loop
    }
}

if ($found === false) {
    // The id you were looking for has not been found, 
    // which means the corresponding item is not already present in your array
    // => Add a new item to the array
}

---

您可以首先存储索引等于id的数组。 例如：

 $arr =Array ( [0] => Array 
     ( [id] => 1 
       [name] => Jonah 
       [points] => 27 )
    [1] => Array 
     ( [id] => 2 
       [name] => Mark 
       [points] => 34 )
  );
 $new = array();
 foreach($arr as $value){
    $new[$value['id']] = $value; 
 }

//So now you can check the array $new for if the key exists already 
if(array_key_exists(1, $new)){
    $new[1]['points'] = 32;
}

---

即使问题已经回答了，我还是想把我的答案贴出来。可能对未来的观众有用。您可以使用过滤器从此数组创建新数组，然后从中检查该数组上是否存在值。您可以遵循以下代码

---

谢谢你的建议，Pascal，只有一个问题-如果我不知道数组的id，有没有办法检查所有数组并检查它是否匹配（例如

[id]==2

或

[name]==Mark

）？你只需更改条件，以反映你想要的；如果（$data['id']=$你要找的id$data['name']=$你要找的名字）

$arr = array(
        0 =>array(
                "id"=> 1,
                "name"=> "Bangladesh",
                "action"=> "27"
            ),
         1 =>array(
                "id"=> 2,
                "name"=> "Entertainment",
                "action"=> "34"
                 )
        );

     $new = array();
     foreach($arr as $value){
        $new[$value['id']] = $value; 
     }


    if(array_key_exists(1, $new)){
        echo $new[1]['id'];
    }
    else {
      echo "aaa";
    }
    //print_r($new);