數組是否可以引用自己

Question

我有這個關聯數組，其中key2和key5始終與key1具有相同的值。是否可以通過引用數組本身或任何其他建議來刪除值重複來設置它們的值？

$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

您可以在陣列已經被宣佈後應用& reference：

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