list()modification

1. list() no longer assigns values ​​in reverse order

list($array[], $array[], $array[]) = [1, 2, 3];
var_dump($array);

The above code will return an array: $array == [1, 2, 3] instead of before [3, 2, 1]

Note: Only the order of assignment changes, the assigned value is still the same as the original.

 list($a, $b, $c) = [1, 2, 3];
 // $a = 1; $b = 2; $c = 3;

The behavior is still the same as the original.

2. Empty list() assignment is no longer allowed.

list() = $a;
list(,,) = $a;
list($x, list(), $y) = $a;

The above codes will report an error when running.

3. list() no longer supports the string splitting function

$string = "xy";
list($x, $y) = $string;

The final result of this code is: $x == null and $y == null (there will be no prompt)

The result of PHP5 operation is: $x == "x" and $y == "y".

4. In addition, list() now also applies to array objects:

list($a, $b) = (object) new ArrayObject([0, 1]);

PHP7 results: $a == 0 and $b == 1.

PHP5 results: $a == null and $b == null.