PHP 通过引用删除

Question

我正在尝试通过引用删除 stdClass 属性。因为不知道属性嵌套了多深，所以在循环中做了引用。但是 unset 方法不会通过引用删除变量。如何在不设置空值的情况下解决它？

<?php
$data = new stdClass();
$data->foo = new stdClass();
$data->foo->bar = 'value';

$pathToRemove = 'foo.bar';

$dataReference = &$data;
foreach (explode('.', $pathToRemove) as $field) {
    $dataReference = &$dataReference->$field;
}
unset($dataReference);

var_dump($data);

Answer 1

遍历除最后一个元素之外的所有元素。然后将最后一个元素作为要删除的字段。

$pathArray = explode('.', $pathToRemove);
$lastField = array_pop($pathArray);
$dataReference = &$data;
foreach ($pathArray as $field) {
    $dataReference = &$dataReference->{$field};
}
unset($dataReference->{$lastField});
unset($dataReference); // don't need the reference variable any more