array_merge()
function
Merges arrays. String keys from later arrays overwrite; numeric keys are re-indexed.
Syntax
array_merge(array ...$arrays): array
Example
php
<?php
$defaults = ['color'=>'blue','size'=>'medium'];
$custom = ['color'=>'red','qty'=>5];
$merged = array_merge($defaults, $custom);
// ['color'=>'red','size'=>'medium','qty'=>5]
// Spread operator (PHP 8.1+)
$merged2 = [...$defaults, ...$custom];