Modern PHP Cheat Sheet

# Destructuring 7.1

You can destructure arrays to pull out several elements into separate variables:

$array = [1, 2, 3];

// Using the list syntax:
list($a, $b, $c) = $array;

// Or the shorthand syntax:
[$a, $b, $c] = $array;

You can skip elements:

[, , $c] = $array;

As well as destructure based on keys:

$array = [
    'a' => 1,
    'b' => 2,
    'c' => 3,
];

['c' => $c, 'a' => $a] = $array;

# Rest and Spread Operators 5.6

Arrays can be spread into functions:

$array = [1, 2];

function foo(int $a, int $b) {  }

foo(...$array);

Functions can automatically collect the rest of the variables using the same operator:

function foo($first, ...$other) {  }

foo('a', 'b', 'c', 'd', …);

Rest parameters can even be type hinted:

function foo($first, string ...$other) {  }

foo('a', 'b', 'c', 'd', …);

7.4 Arrays with numerical keys can also be spread into a new array:

$a = [1, 2];
$b = [3, 4];

$result = [...$a, ...$b]; 

8.1 You can also spread arrays with textual keys starting from PHP 8.1

from Hacker News https://ift.tt/3fi1jqv