How could I modify an array inside foreach loop?

Question

I have this code but does not work.

$arr1 = array('test1', 'test2', 'test3');
$arr2 = array(1, 2, 3);

foreach ($arr1 as $x) {
    $m = array_shift($arr2);

    //at this point, $arr2 remains unchanged, why?

    continue;
}

$arr2 does not seem to change within and in between iterations. Any insights will be highly appreciated. Thanks!

possible duplicate of change initial array inside the foreach loop? — VeeeneX
– VeeeneX, Commented Feb 8, 2015 at 12:12
"at this point, $arr2 remains unchanged, why?" What evidence do you have that $arr2 is unchanged? Please post code that indicates this definitively. — kmoser
– kmoser, Commented Oct 16, 2022 at 3:26

Tyron · Accepted Answer · 2015-02-08 12:20:55Z

0

This does work. This code here:

$arr1 = array('test1', 'test2', 'test3');
$arr2 = array(1, 2, 3);

foreach ($arr1 as $x) {
    $m = array_shift($arr2);

    print_r($arr2);

    continue;
}

Will print this:

Array ( [0] => 2 [1] => 3 ) Array ( [0] => 3 ) Array ( )

edited Feb 8, 2015 at 12:20

answered Feb 8, 2015 at 12:13

Tyron

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