Numerically indexed arrays
When declaring arrays, a trailing space must be added after each comma delimiter to improve readability:
$myarray = [1, 2, 3, 'Stuff', 'Here'];
Multi-line indexed arrays are fine, but pad each successive lines as above with an 4-space indent:
$myarray = [1, 2, 3, 'Stuff', 'Here',
$a, $b, $c, 56.44, $d, 500];
Note that the example above also can be written as follows:
(with special attention to the last line having a trailing comma to extend the list of items later with a cleaner diff)
$myarray = [
1, 2, 3, 'Stuff', 'Here',
$a, $b, $c, 56.44, $d, 500,
];
In any case, brackets and newlines need to be balanced, irrespectively of the number of elements per line.