Rererence
In PHP variables are NOT passed by reference (& needed)
/**
* Variable are passed by value (not by reference)
*/
$a = 1;
$x = $a;
$y =& $a; // Look Here
$a = 2;
var_dump($x == 1); // true
var_dump($x != 2); // true
var_dump($y == 2); // true
Array
Reference with foreach changes the array.
/**
* Reference with foreach changes the array
* Use it with care
*/
$A = [1, 2, 3, 4];
foreach ($A as &$val) { // Look Here
$val *= 2;
}
var_dump($A == [2, 4, 6, 8]); // true
var_dump($A != [1, 2, 3, 4]); // true
Last update: 451 days ago
