array_push() in function scope not affecting variable in global scope

Question

I have array_push() inside of a function and need to run it inside a foreach() filling the new array. Unfortunately I can't see why this does not work.

$mylist = array('house', 'apple', 'key', 'car');
$mailarray = array();

foreach ($mylist as $key) {
    online($key, $mailarray);
}

function online($thekey, $mailarray) {
    array_push($mailarray, $thekey);

}
print_r($mailarray);

This is a sample function, it has more functionality and that's why I need to maintain the idea.

Ry- · Accepted Answer · 2022-03-24 04:09:19Z

19

PHP treats arrays as a sort of “value type” by default (copy on write). You can pass it by reference:

function online($thekey, &$mailarray) {
    $mailarray[] = $thekey;
}

Comments

kero · Accepted Answer · 2013-11-23 23:44:02Z

9

You need to pass the array by reference.

function online($thekey, &$mailarray) {

answered Nov 23, 2013 at 23:44

kero

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