Discussion on: Never use array_merge in a loop

View post

Replies for: I try to avoid anything like this in PHP because I always have to look up what the difference is between array_merge and the + operator, and what o...

Ah, it looks like it's been in PHP since 5.6 as an argument unpacker but only been able to unpack general arrays since 7.4.

Well, you can use it for versions <7.4 as:

$merged = array_merge([], ...array_values($lists));

And from 7.4, array_merge accept no arguments, therefore we can use it without the empty array as first arg:

$merged = array_merge(...array_values($lists));