**`array_merge()` Function in PHP**

The `array_merge()` function in PHP merges one or more arrays into a single array. It takes variable number of arguments and returns a new array that contains the elements of all the input arrays.

Syntax:

“`php
array_merge(array1, array2, …, arrayn)
“`

Parameters:

* array1, array2, …, arrayn: The arrays to be merged.

Example:

“`php
$array1 = [“a”, “b”, “c”];
$array2 = [“d”, “e”, “f”];
$result = array_merge($array1, $array2);
“`

The $result array will contain the following elements:

“`
[“a”, “b”, “c”, “d”, “e”, “f”]
“`

The `array_merge()` function can also be used to merge associative arrays. In this case, the keys of the input arrays are preserved in the resulting array.

Example:

“`php
$array1 = [“a” => “apple”, “b” => “banana”];
$array2 = [“c” => “cherry”, “d” => “date”];
$result = array_merge($array1, $array2);
“`

The $result array will contain the following elements:

“`
[“a” => “apple”, “b” => “banana”, “c” => “cherry”, “d” => “date”]
“`

The `array_merge()` function is a useful function that can be used to combine data from multiple arrays into a single array. It is a core function in PHP and is used in many applications.

Here are some of the common use cases of the `array_merge()` function:

* Merging two or more arrays into a single array
* Combining associative arrays
* Adding new elements to an existing array
* Removing duplicate values from an array
* Sorting an array

The `array_merge()` function is a versatile and powerful function that can be used to manipulate arrays in a variety of ways. It is a core function in PHP and is used in many applications.