- print_r: documentation ( source)
- array_replace_recursive: documentation ( source)
<?php
$a = ['extend' => ['owner' => 'custom']];
$b = [
'extend' => [
'owner' => 'system',
'is_extend' => true,
'table' => 'orocrm_account',
],
];
print_r(array_replace_recursive($b, $a));