php - 数组可以引用自身吗

Question

我有这个关联数组，其中 key2 和 key5 总是与 key1 具有相同的值。是否可以通过引用数组本身或任何其他删除值重复的建议来设置它们的值？

$arr = array(
   'key1' => 'some value',
   'key2' => 'some value', //same as key1 and will always stay as key1
   'key3' => 'some other value',
   'key4' => 'yet another',
   'key5' => 'some value'  //same as key1 and will always stay as key1
);

Answer 1

您可以申请 & reference声明数组后:

$arr = array(...);
$arr["key2"] = & $arr["key1"];
$arr["key5"] = & $arr["key1"];