Online PHP editor | output for hfFZm

<?php # Forget array_merge PHP 7.4 Spread Operator in Array Expression. # ONLY FOR PHP 7.4 + #/!\ PERFORMANCE BEST PRACTIVE /!\ $args = ['foo', 'bar', 'baz']; $arr = [...$args, 'buz']; var_dump($arr); # MULTIPLE SPREAD $arr1 = [1, 2, 3]; $arr2 = [4, 5, 6]; $arr3 = [...$arr1, ...$arr2]; $arr4 = [...$arr1, ...$arr3, 7, 8, 9]; var_dump($arr4); # SPREAD WITH FUNCTION function buildArray() { return ['red', 'green', 'blue']; } $arr5 = [...buildArray(), 'pink', 'violet', 'yellow']; var_dump($arr5); # SPREAD WITH GENERATOR function generator() { for ($i = 3; $i <= 5; $i++) { yield $i; } } $arr6 = [0, 1, 2, ...generator()]; var_dump($arr6); # SPEACIAL USECASE WHEN YOU NEED TO UNPACK ELEMENT WITH REFERENCE # $arr1 = ['red', 'green', 'blue']; # $arr2 = [...&$arr1]; # This will throw a syntax error because ...& isn't supported yet # To do that you will use another way like this : $arr7 = 'red'; $arr8 = [&$arr7, 'green', 'blue']; $arr9 = ['white', ...$arr8, 'black']; var_dump($arr9);