How to merge arrays in php

PHP How to merge arrays

In PHP, arrays are a very common data type. It can be used to store a set of related data and can be easily manipulated. Sometimes, during the development process, we need to merge two or more arrays. In this case, we need to use the array merging function provided by PHP. In this article, we will explain how to merge arrays in PHP.

Array merge function

PHP provides two array merge functions: array_merge() and array_merge_recursive(). The function of both functions is to merge one or more arrays into one array.

array_merge()

array_merge() function is to merge multiple arrays into one array in order. If there are the same keys, the values ​​in the subsequent array will overwrite the values ​​in the previous array.

array array_merge (array $array1 [, array $array2 [, array $... ]] )

Parameter description:

array1: required. The first array to merge.

array2: Optional. The second array to merge.

...: Optional. The third, fourth, and Nth arrays to merge.

Example:

$arr1 = array('a','b','c');
$arr2 = array('d' ,'e','f');

$arr3 = array_merge($arr1, $arr2);

print_r($arr3);
?>

The output result is:

Array
(

[0] => a
[1] => b
[2] => c
[3] => d
[4] => e
[5] => f

)

array_merge_recursive()

array_merge_recursive() The function of the function is to merge multiple Arrays are recursively merged into a single array. If there are the same keys, the values ​​of the subsequent arrays will be merged into one array.

array array_merge_recursive ( array $array1 [, array $array2 [, array $... ]] )

Parameter description:

array1: required. The first array to merge.

array2: Optional. The second array to merge.

...: Optional. The third, fourth, and Nth arrays to merge.

Example:

$arr1 = array('a' => array('apple'),'b' => array('banana' ));
$arr2 = array('b' => array('blueberry'),'a' => array('apricot'));

$arr3 = array_merge_recursive($ arr1, $arr2);

print_r($arr3);
?>

The output result is:

Array
(

[a] => Array
    (
        [0] => apple
        [1] => apricot
    )

[b] => Array
    (
        [0] => banana
        [1] => blueberry
    )

)

Explanation: Both arrays $arr1 and $arr2 have the same keys 'a' and 'b'. After using array_merge_recursive(), the same keys 'a' and 'b' will be recursively merged into an array.

Summary

Arrays are a very common data type in PHP. During the development process, arrays sometimes need to be merged. In PHP, there are two array merging functions: array_merge() and array_merge_recursive(). The function of array_merge() is to merge multiple arrays into one array in sequence. The function of array_merge_recursive() is to recursively merge multiple arrays into one array in order. If there are the same keys, the values ​​of the subsequent arrays will be merged into one array.

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