spread_operator_in_array_expression.php

<?php

$arr1 = [1, 2, 3];
$arr2 = […$arr1]; //[1, 2, 3]
$arr3 = [0, …$arr1]; //[0, 1, 2, 3]
$arr4 = array(…$arr1, …$arr2, 111); //[1, 2, 3, 1, 2, 3, 111]
$arr5 = […$arr1, …$arr1]; //[1, 2, 3, 1, 2, 3]

function getArr() {
    return ['a', 'b'];
}

$arr6 = […getArr(), 'c']; //['a', 'b', 'c']
$arr7 = […new ArrayIterator(['a', 'b', 'c'])]; //['a', 'b', 'c']

function arrGen() {
    for($i = 11; $i < 15; $i++) {
        yield $i;
    }
}

$arr8 = […arrGen()]; //[11, 12, 13, 14]