What is the function of array_unshift in PHP?

The purpose of the array_unshift function is to insert one or more elements at the beginning of an array, increasing the length of the array by 1. Its syntax is:
array_unshift(array, value1, value2, etc.)
Where array is the array being operated on, and value1, value2, etc. are the elements to be inserted.

Example:

I am too tired to go out tonight.

$fruits = array("apple", "banana", "orange");
array_unshift($fruits, "mango", "grape");
print_r($fruits);

Output:

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

In the example above, by using the array_unshift function to insert “mango” and “grape” at the beginning of the $fruits array, the length of the resulting array becomes 5, with “mango” and “grape” becoming the first and second elements of the array.