配列をkeyにできる辞書書いた

Python連想配列はタプルをkeyにできて色々便利そうだったのでPHPでも似たようなことができるようにした。

<?php

class Dictionary implements IteratorAggregate
{
    protected $dict = array();
    function put($keyval, $value)
    {
        $key = $this->buildHash($keyval);
        $this->dict[$key] = $value;
        return $this;
    }
    
    function get($keyval, $defaultval = null)
    {
        $key = $this->buildHash($keyval);
        if (!isset($this->dict[$key])) return $defaultval;
        return $this->dict[$key];
    }
    protected function buildHash($keyval)
    {
        if (is_array($keyval)) $keyval = $this->sortArray($keyval);
        return serialize($keyval);
    }
    function getIterator()
    {
        return new ArrayIterator(array_values($this->dict));
    }
    protected function sortArray(Array $arr)
    {
        ksort($arr);
        foreach ($arr as $key => $val) 
            if (is_array($val)) $arr[$key] = $this->sortArray($val);
        
        return $arr;
    }
}

使い方

<?php
$hoge = new Dictionary();
$hoge->put(array(), 'hoge');
$hoge->put(@array(id => 1, page => 2), 'fuga');
$hoge->put(@array(hoge, fuga, piyo), 'piyo');

$hoge->get(array());  //=>'hoge'
$hoge->get(@array(page =>2, id => 1));  //=>'fuga'
$hoge->get(@array(hoge, fuga, piyo));  //=>'piyo'