<?php $arr = [ ['foo', 'bar', 'hello'], ['world', 'love'], ['stack', 'overflow', 'yep', 'man', 'wow'] ]; $new = []; }
Standard input is empty
Array
(
[0] => foo
[1] => bar
[2] => hello
[3] => world
[4] => love
[5] => stack
[6] => overflow
[7] => yep
[8] => man
[9] => wow
)