PHP foreach Reference &

Print the following code

$variable = [‘a‘, ‘b‘, ‘c‘];foreach ($variable as $key => &$value) {}foreach ($variable as $key => $value) {}echo "<pre />";var_dump($variable);echo "<pre />";#结果array(3) {  [0]=>  string(1) "a"  [1]=>  string(1) "b"  [2]=>  &string(1) "b"}

The printed result is inconsistent with the expected result because the reference is used in the first foreach, and the $value becomes a reference variable, so $value and $a [2] point to the same address space (shared variable value), in the second foreach, The value of the $arr is constantly assigned to $value, and the value of $arr[2] will be changed by the $value of the follower , and the result of the $variable printed in the second time

Changes in $value value and $arr[2] Value

PHP foreach Reference &