Merge operation of arrays in PHP8.0: array_merge

In PHP8.0 version, the array merging operation has been improved. This improvement mainly targets the merging operation of array data types.

In previous versions, the array merging operations provided by PHP were implemented using the " " symbol. However, there are some problems with this approach. If two arrays contain the same keys, the key values ​​in the second array will overwrite the key values ​​in the first array. If you need to merge the two arrays together, you need to use the array_merge() function skillfully. .

Now, in the PHP8.0 version, the merging operation of arrays has been improved, and we can use the array_merge() function to achieve this function.

The array_merge() function can merge multiple arrays into one array and return a new array. If the key names in two arrays are the same, the values ​​in the later array will overwrite the values ​​in the previous array.

The way to use the array_merge() function is very simple. Just pass the arrays to be merged as parameters to the function. The following is an example of using the array_merge() function:

$array1 = array("a" => "apple", "b" => "banana");
$array2 = array("c" => "cherry", "d" => "date");
$array3 = array_merge($array1, $array2);
print_r($array3);

Output results:

Array
(
    [a] => apple
    [b] => banana
    [c] => cherry
    [d] => date
)

In this example, we define two arrays $array1 and $array2, and then use array_merge() Merging these two arrays creates a new array $array3. As can be seen from the output, $array3 contains all elements in $array1 and $array2.

What happens if the key names in the two arrays are the same? In this case, the values ​​in the later array overwrite the values ​​in the earlier array. The following is an example:

$array1 = array("a" => "apple", "b" => "banana");
$array2 = array("b" => "blueberry", "c" => "cherry");
$array3 = array_merge($array1, $array2);
print_r($array3);

Output result:

Array
(
    [a] => apple
    [b] => blueberry
    [c] => cherry
)

In this example, both $array1 and $array2 contain the key "b", but the "b" key in $array2 The value overwrites the value of the "b" key in $array1.

It should be noted that the array_merge() function can only be used to merge multiple arrays. If you need to merge two arrays, you can use the " " operator, but this method has some of the problems mentioned above, so try to use the array_merge() function.

To summarize, the merging operation of arrays in PHP8.0 is implemented using the array_merge() function. This function can merge multiple arrays into a new array. If the key names in the two arrays are the same, the values ​​in the later array will overwrite the values ​​in the previous array. When writing PHP programs, we can flexibly use this function to meet different needs.

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