- print_r: documentation ( source)
- array_merge: documentation ( source)
<?php
print_r(array_merge(
['test' => 0, 'shmest' => 0, 'fest' => 0],
['test' => 1],
['shmest' => 1],
['shmest' => 2, 'fest' => 3]
));
print_r(
['test' => 0, 'shmest' => 0, 'fest' => 0]
+ ['test' => 1]
+ ['shmest' => 1]
+ ['shmest' => 2, 'fest' => 3]
);