How to merge two or more arrays in PHP?

Use the array_merge() function to merge two or more arrays into one new array. You can also use the + operator, but it works in a different way.

<?php
$a = [1, 2];
$b = [3, 4];
$c = [5, 6];

print_r(array_merge($a, $b, $c));
?>

Output:

array_merge() vs + operator. When two arrays have the same string key, array_merge() keeps the later value, but the + operator keeps the first value.

<?php
$x = ["a" => "Apple", "b" => "Banana"];
$y = ["b" => "Blueberry", "c" => "Cherry"];

print_r(array_merge($x, $y));
print_r($x + $y);
?>

Output:

For numeric keys, array_merge() renumbers the keys from 0, while + keeps the keys and skips the ones that already exist. From PHP 7.4 you can also merge with the spread operator, like [...$a, ...$b].

• Previous Interview Question
• Next Interview Question

---

Tutorials
No Content Found.

Exercises & Assignments
No Content Found.

Interview Questions & Answers
No Content Found.