There are several ways to merge arrays in php

There are four ways to merge arrays in php, which are: 1. Use operators to merge the elements of two or more arrays into one array; 2. Use the array_merge function to add the elements of all arrays. into a new array; 3. Use the array_replace function to merge the elements of one or more arrays into the first array; 4. Use the array_merge_recursive function to recursively merge two or more arrays into one array.

The operation of merging arrays in PHP is very common and is usually used to merge the elements of two or more arrays into one array. In PHP, there are many ways to merge arrays.

1. Use the operator

The operator in PHP can merge two arrays into one array. It adds the elements of the second array to the first array, retaining the values ​​from the first array if there are the same keys in both arrays. The following is a sample code:

$array1=array("apple","banana","orange");
$array2=array("pineapple","grape","mango");
$result=$array1+$array2;
print_r($result);
输出结果为：
Array
(
[0]=>apple
[1]=>banana
[2]=>orange
[3]=>pineapple
[4]=>grape
[5]=>mango
)

2. Use the array_merge function

The array_merge function can merge two or more arrays into one array. It will add all array elements to a new array, and if they have the same key name, the later values ​​will overwrite the previous ones. The following is a sample code:

$array1=array("apple","banana","orange");
$array2=array("pineapple","grape","mango");
$result=array_merge($array1,$array2);
print_r($result);

The output result is:

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

3. Use the array_replace function

array_replace function to replace one or more arrays Elements are merged into the first array. It replaces the element value with the same key name with the element value in the subsequent array. The following is a sample code:

$array1=array("apple","banana","orange");
$array2=array(1=>"pineapple",2=>"grape");
$result=array_replace($array1,$array2);
print_r($result);

The output result is:

Array
(
[0]=>apple
[1]=>pineapple
[2]=>grape
)

4. Use the array_merge_recursive function

array_merge_recursive function to merge two or more arrays Recursively merge into an array. It merges elements with the same key into an array. The following is a sample code:

$array1=array("apple","banana","orange");
$array2=array("pineapple","grape","mango");
$result=array_merge_recursive($array1,$array2);
print_r($result);
输出结果为：
Array
(
[0]=>apple
[1]=>banana
[2]=>orange
[3]=>pineapple
[4]=>grape
[5]=>mango
)

Through the above introduction, we can understand several ways to merge arrays in PHP. Select appropriate methods for merging based on actual needs to meet project requirements. Whether you use the operator, array_merge function, array_replace function or array_merge_recursive function, you can flexibly perform array merge operations.

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