How to add elements to multidimensional array in php

Multidimensional array refers to an array containing array elements, so how to add elements to a multidimensional array? This article will introduce to you how to add elements to multi-dimensional arrays in PHP.

Multidimensional arrays are written as follows:

$multi_dimensional_array = [
    ["张三", "25", "male"],
    ["李四", "18", "female"],
    ["王二", "29", "female"]
];

In this way, you can store and manage multiple arrays in an array.

Add elements to a multidimensional array

Add elements to the end of the array

To add elements to To add to the end of a multidimensional array, use [] to add elements or use the array_push function to add elements.

Let’s look at specific examples

$multi_dimensional_array = [
    ["张三", "25", "male"],
    ["李四", "18", "female"],
    ["王二", "29", "female"]
];
$multi_dimensional_array[] = ["陈五", "20", "male"];
var_dump($multi_dimensional_array);

The output results of the above example code are as follows.

array(4) {
  [0]=>
  array(3) {
    [0]=>
    string(6) "张三"
    [1]=>
    string(2) "25"
    [2]=>
    string(4) "male"
  }
  [1]=>
  array(3) {
    [0]=>
    string(6) "李四"
    [1]=>
    string(2) "18"
    [2]=>
    string(6) "female"
  }
  [2]=>
  array(3) {
    [0]=>
    string(6) "王二"
    [1]=>
    string(2) "29"
    [2]=>
    string(6) "female"
  }
  [3]=>
  array(3) {
    [0]=>
    string(6) "陈五"
    [1]=>
    string(2) "20"
    [2]=>
    string(4) "male"
  }
}

The added element is stored at the end of the array

Another way to add an element to the end of the array is to call the array_push

array_push function to specify the second The elements of the parameter, the array to be added to the first parameter.

Let’s try using the array_push function, as shown in the sample code below.

$multi_dimensional_array = [
    ["张三", "25", "male"],
    ["李四", "18", "female"],
    ["王二", "29", "female"]
];
array_push($multi_dimensional_array,["陈五", "20", "male"]);
var_dump($multi_dimensional_array);

The output will be the same as above.

Add elements to the beginning of the array

To add elements to the beginning of the array we need to use the array_unshift function

The code is as follows

$multi_dimensional_array = [
    ["张三", "25", "male"],
    ["李四", "18", "female"],
    ["王二", "29", "female"]
];
array_unshift($multi_dimensional_array,["陈五", "20", "male"]);
var_dump($multi_dimensional_array);

The output result is as follows

array(4) {
  [0]=>
  array(3) {
    [0]=>
    string(6) "陈五"
    [1]=>
    string(2) "20"
    [2]=>
    string(4) "male"
  }
  [1]=>
  array(3) {
    [0]=>
    string(6) "张三"
    [1]=>
    string(2) "25"
    [2]=>
    string(4) "male"
  }
  [2]=>
  array(3) {
    [0]=>
    string(6) "李四"
    [1]=>
    string(2) "18"
    [2]=>
    string(6) "female"
  }
  [3]=>
  array(3) {
    [0]=>
    string(6) "王二"
    [1]=>
    string(2) "29"
    [2]=>
    string(6) "female"
  }
}

It can be seen from the output result that the elements added by the array_unshift function are added to the beginning.

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