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Discussion on: Never use array_merge in a loop

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Replies for: 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.

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Jose Maria Valera Reales •

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

$merged = array_merge([], ...array_values($lists));
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Check it out: sandbox.onlinephpfunctions.com/cod...

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));
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