There are several ways to merge arrays in php

There are four methods for php array merging. Detailed introduction: 1. Use the array_merge() function to accept multiple arrays as parameters and return a merged array; 2. Use the " " operator to merge two arrays into a new array and return the result; 3. Use the array_merge_recursive() function to merge two or more arrays, and can handle the merging of multi-dimensional arrays; 4. Use the array_replace() function, etc.

The operating environment of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

In PHP, array merging is a common operation that combines two or more arrays into one array. PHP provides a variety of methods to implement array merging, and this article will introduce several common methods.

1. Use the array_merge() function

The array_merge() function is one of the most commonly used array merging methods in PHP. It accepts multiple arrays as parameters and returns a merged array. Here is an example:

$array1 = array('a', 'b', 'c');
$array2 = array('d', 'e', 'f');
$result = array_merge($array1, $array2);
print_r($result);

The output result is:

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

2. Use the " "operator

" "The operator can also be used Array merging. It merges two arrays into a new array and returns the result. The following is an example:

$array1 = array('a', 'b', 'c');
$array2 = array('d', 'e', 'f');
$result = $array1 + $array2;
print_r($result);

The output result is:

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

It should be noted that the " " operator will retain the key value in the first array when merging arrays. If the same key exists in two arrays, the key value in the second array will be ignored.

3. Use the array_merge_recursive() function

The array_merge_recursive() function is used to merge two or more arrays, and can handle the merging of multi-dimensional arrays. The following is an example:

$array1 = array('a' => 'apple', 'b' => 'banana');
$array2 = array('a' => 'orange', 'c' => 'cherry');
$result = array_merge_recursive($array1, $array2);
print_r($result);

The output result is:

Array
(
[a] => Array
(
[0] => apple
[1] => orange
)
[b] => banana
[c] => cherry
)

As you can see, the array_merge_recursive() function merges the same key values ​​into an array when merging arrays.

4. Use the array_replace() function

The array_replace() function is used to replace the value of one array with the value of another array. It accepts multiple arrays as parameters and returns a merged array. The following is an example:

$array1 = array('a', 'b', 'c');
$array2 = array(1, 2, 3);
$result = array_replace($array1, $array2);
print_r($result);

The output result is:

Array
(
[0] => 1
[1] => 2
[2] => 3
)

As you can see, the array_replace() function replaces the value of the $array1 array with the value of the $array2 array and returns a new array.

Summary:

This article introduces several common methods of array merging in PHP, including array_merge() function, " " operator, array_merge_recursive() function and array_replace ()function. According to actual needs, choose the appropriate method to implement array merging operations .

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