And we can merge two or more arrays into one with array_merge:
<?php $good = ['A', 'B', 'C']; $bad = ['Q', 'V', 'P']; $all = array_merge($good, $bad); var_dump($all); ?>/*w w w .j a va2 s . c o m*/
The keys of the second array are now different.
Both the arrays had the same numeric keys, and an array cannot have two values for the same key.