复杂类型作为数组索引

听起来你想重新发现 SplObjectStorage 类,它可以提供从对象到其他数据(在您的情况下,是其他对象)的映射。

它实现了ArrayAccess接口,这样您甚至可以使用所需的语法,如 $store[$obj_a] = $obj_b .

http://php.net/manual/en/function.spl-object-hash.php

serialize($obj) 作为关键。重新创建对象调用 unserialize

仍然没有找到原稿,但记住了真正的诀窍,所以我重新实现了它:
(昨天我的网络连接断了,给了我时间)

class FancyArray implements ArrayAccess {

    var $_keys = array();
    var $_values = array();

    function offsetExists($name) {
        return $this->key($name) !== FALSE;
    }

    function offsetGet($name) {
        $key = $this->key($name);
        if ($key !== FALSE) {
            return $this->_values[ $key ];
        }
        else {
            trigger_error("Undefined offset: {{$name}} in FancyArray __FILE__ on line __LINE__", E_USER_NOTIC
            return NULL;
        }
    }

    function offsetSet($name, $value) {
        $key = $this->key($name);
        if ($key !== FALSE) {
            $this->_values[$key] = $value;
        }
        else {
            $key = end(array_keys($this->_keys)) + 1;
            $this->_keys[$key] = $name;
            $this->_values[$key] = $value;
        }
    }

    function offsetUnset($name) {
        $key = $this->key($name);
        unset($this->_keys[$key]);
        unset($this->_values[$key]);
    }

    function key($obj) {
        return array_search($obj, $this->_keys);
    }
}

$x = new FancyArray();

$x[array(1,2,3,4)] = $something_else;   // arrays as key

print $x[new SplFileInfo("x")];    // well, if set beforehand