How to remove specified key value from php two-dimensional array

In PHP, a two-dimensional array is a very common data structure. It can store a large amount of data and can be sorted, searched and other operations according to certain rules. However, in some cases, we may need to remove the key values ​​​​from the two-dimensional array to facilitate operation.

At this time, we can use some PHP functions to achieve this goal. Below, I will introduce you to several commonly used methods:

1. array_values() function

array_values() function is to return all the values ​​​​of an array, and The array will be reindexed. We can use this feature to remove the key values ​​​​from the two-dimensional array.

Sample code:

// 定义一个二维数组
$arr = [
    ['name' => 'Alice', 'age' => 20],
    ['name' => 'Bob', 'age' => 22],
    ['name' => 'Mike', 'age' => 25],
];

// 使用array_values()函数
$newArr = array_values($arr);

// 输出新的数组
print_r($newArr);

Running results:

Array
(
    [0] => Array
        (
            [name] => Alice
            [age] => 20
        )

    [1] => Array
        (
            [name] => Bob
            [age] => 22
        )

    [2] => Array
        (
            [name] => Mike
            [age] => 25
        )

)

As you can see, through the array_values() function, we successfully removed the key values ​​​​of the two-dimensional array, and New indexes are also regenerated in sequence.

2. foreach loop

In addition to using functions, we can also remove the key values ​​​​of the two-dimensional array through loops. The specific method is to use a foreach loop to traverse the array and store the value of each element in a new array, as shown below:

// 定义一个新的数组
$newArr = [];

// 使用foreach循环
foreach ($arr as $item) {
    $newArr[] = array_values($item);
}

// 输出新的数组
print_r($newArr);

The running result is the same as the previous example.

3. array_map() function

array_map() function is one of the PHP built-in functions, which is used to apply a callback function to each element in the array . In this article, we can use the array_map() function to store values ​​as array elements into a new array, thus removing the keys from the original array.

Sample code:

// 使用array_map()函数
$newArr = array_map('array_values', $arr);

// 输出新的数组
print_r($newArr);

The running result is the same as the previous example.

Summary

Through the above three methods, we can easily remove the key values ​​​​of the PHP two-dimensional array and generate a new array. In this way, in practical applications, we can operate arrays more flexibly and solve problems quickly.

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