How to add elements from the end of an array in php

Method: 1. Use "array_push(array, element list)" to insert one or more elements at the end; 2. Use "array_splice(array, count(array),0,insert value)" ;3. Use "array_merge(array1,array2)" to store the value of array2 into array1.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, DELL G3 computer

php starts from the end of the array Methods to add elements

1. Use the array_push() function to add elements from the end of the array

The array_push() function can insert an element at the end of the array or multiple elements (key values), the syntax is as follows:

array_push($array,$value1,$value2...)

Example:

<?php
$arr=array(10,12,20);
array_push($arr,8,"9",3.14);
var_dump($arr);
?>

It can be seen that 3 are inserted at the end of the $arr array Elements: integer "8", string "9" and floating point number "3.14".

The elements inserted by the array_push() function can be of array type

<?php
$arr=array(10,12,20);
var_dump($arr);
array_push($arr,array(1,2,3));
var_dump($arr);
?>

2. Use the array_splice() function to add elements from the end of the array

array_splice($array,$start,$length,$value)The function is a powerful function that can be used to delete array elements, replace array elements, and also insert Array elements (just set parameter $length to 0).

When $length=0, then the parameter $start can specify the position (subscript) to start inserting, and the parameter $value can The insertion value can be specified (if there are multiple values, it needs to be set as an array).

And when the value of $start is set to "array length value", that is, count($arr) can be at the end of the array Insert elements.

<?php
header("Content-type:text/html;charset=utf-8");
$arr1=array(10,12,20);
array_splice($arr1,count($arr1),0,"1");
var_dump($arr1);

$arr2=array(10,12,20);
array_splice($arr2,count($arr2),0,array("1",25,"3"));
var_dump($arr2);
?>

The output result is:

3. Use the array_pad() function to add elements from the end of the array

array_pad($array,$size,$value)The function can insert a key value $value into the array $array, thereby Pads the array to the specified length $size. (The $size parameter can be understood as the final number of elements in the array, that is, the length of the array after the insertion operation).

So how to use the array_pad() function to add elements from the end of the array? The key is the $size parameter.

• When the $size parameter is a positive number, elements are inserted at the end of the array.

<?php
$arr=array(10,12,20);
$result =array_pad($arr,5,1);
var_dump($result);
?>

The elements inserted by the array_pad() function can be of array type, then the original array will become a two-dimensional array.

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(10,12,20);
$result =array_pad($arr,5,array("张三",25,"男"));
var_dump($result);
?>

The output result is:

4. Use the array_merge() function to add elements from the end of the array

array_merge(array1,array2,array3...) The function is used to merge one or more arrays into one array, and store the values ​​of array2,array3... into array1 in.

If two or more array elements have the same key name, the last element will overwrite the other elements.

<?php
header("Content-type:text/html;charset=utf-8");
$arr=array(10,12,20);
$result =array_merge($arr,array(2,3,4)) ;
var_dump($result);
?>

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