How to splice arrays in php (two methods)

During the PHP development process, it is often necessary to splice arrays. This can be achieved using the array_merge() function or the " " operator. The use of these two methods will be introduced in detail below.

1. Use the array_merge() function

array_merge() function is used to merge two or more arrays into one array and return it. It will append the subsequent array contents to the front in sequence. array and use the new array as the return value. The syntax of this function is as follows:

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

Among them, the $array1 parameter is a required parameter and represents the first array. The $... parameter represents an optional parameter, which is the name of other arrays to be merged.

The following is an example of using the array_merge() function to splice arrays:

// 定义两个数组
$arr1 = array('a', 'b', 'c');
$arr2 = array(1, 2, 3);

// 使用 array_merge() 函数将两个数组合并成一个新的数组
$result = array_merge($arr1, $arr2);

print_r($result);

The output result of the above code is:

Array
(

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

)

As you can see, two arrays can be completely merged together using the array_merge() function.

2. Use the " " operator

The " " operator can also be used for array splicing. Its function is to merge two arrays into a new array and retain the contents of the original array. The key name and the corresponding value. If there are the same key names, the value of the subsequent array will overwrite the value of the previous array.

The following is an example of using the " " operator to splice arrays:

// 定义两个数组
$arr1 = array('a' => 1, 'b' => 2, 'c' => 3);
$arr2 = array('d' => 4, 'e' => 5, 'a' => 6);

// 使用“+”操作符将两个数组合并成一个新的数组
$result = $arr1 + $arr2;

print_r($result);

The output result of the above code is:

Array
(

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

)

You can see that using the " " operator will merge the arrays together and retain the key names and corresponding values ​​​​in the original array. If there are the same key names, the values ​​​​of the subsequent arrays will be overwritten. The value of the previous array.

3. Use the array_merge() function in combination with the " " operator

If you want to retain the key names and corresponding values ​​​​in the original array at the same time, and merge the arrays together completely, you can Use the array_merge() function with the " " operator.

The following is an example of using the array_merge() function and the " " operator to splice arrays:

// 定义两个数组
$arr1 = array('a' => 1, 'b' => 2, 'c' => 3);
$arr2 = array('d' => 4, 'e' => 5, 'a' => 6);

// 结合使用 array_merge() 函数和“+”操作符将两个数组合并成一个新的数组
$result = $arr2 + $arr1;

print_r($result);

The output result of the above code is:

Array
(

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

)

As you can see, using the array_merge() function in combination with the " " operator can completely merge the arrays together and retain the key names and corresponding values ​​​​in the original array. .

To sum up, you can use the array_merge() function or the " " operator to splice arrays in PHP, and use different methods according to different needs.

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