- var_dump: documentation ( source)
<?php
$arr = [
'deep' => [
'bar' => 'foo',
],
];
foreach($arr['deep'] ?? [] as &$value) {
$value = 'x';
}
var_dump('x' === $arr['deep']['bar']);
foreach($arr['deep'] as &$value) {
$value = 'x';
}
var_dump('x' === $arr['deep']['bar']);