How to append elements after array in php

In PHP, appending elements to an existing array is a common requirement in many scenarios. This requirement can be achieved through the array operation functions provided by PHP. This article will introduce several methods of appending to arrays.

Using array_push() Function

array_push() The function is a way to add array elements in PHP. This function can be used to add one or more elements to the end of an array, a process also known as push.

array_push() The syntax of the function is as follows:

array_push($array, $value1, $value2, $value3, ......);

where $array is the array to which elements are to be added, followed by $value1 , $value2, $value3, ... are the values ​​to be added to the array $array.

Sample code:

$my_array = array("apple", "banana", "orange");

// 在数组的末尾添加一个元素
array_push($my_array, "grape");

// 在数组的末尾添加多个元素
array_push($my_array, "mango", "watermelon");

print_r($my_array);

Output:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [3] => grape
    [4] => mango
    [5] => watermelon
)

Using $array[] = $value Syntax

PHP also provides Another syntax for adding elements after an array is $array[] = $value. This method does not require calling any functions. It directly adds an empty [] to the array, and then fills the added elements in [].

Sample code:

$my_array = array("apple", "banana", "orange");

// 添加一个元素
$my_array[] = "grape";

// 添加多个元素
$my_array[] = "mango";
$my_array[] = "watermelon";

print_r($my_array);

Output:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [3] => grape
    [4] => mango
    [5] => watermelon
)

Using array_push() with variadic arguments

After PHP 5.6 version , variable-length arguments were introduced into functions. Using variadic parameters allows a function to accept an indefinite number of parameters. When adding elements after the array, you can also use variable parameters, as shown below:

function add_to_array(&$array, ...$values) {
    foreach ($values as $value) {
        array_push($array, $value);
    }
}

$my_array = array("apple", "banana", "orange");
add_to_array($my_array, "grape", "mango", "watermelon");

print_r($my_array);

Output:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [3] => grape
    [4] => mango
    [5] => watermelon
)

A add_to_array() function is defined here , use variable parameters $values to accept multiple elements to be added. The function loops through $values and calls the array_push() function to add elements to the $array array.

Conclusion

The above are several ways to append elements after an array in PHP. Using array_push() is the simplest way, while using the $array[] = $value syntax is more concise. Using variable parameters is suitable for adding multiple elements to a function. Just choose the appropriate method according to the actual situation.

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