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Type Hints can only be of the object and array (since PHP 5.1) type. Traditional type hinting with int and string isn't supported. referer

	We will not provide typehints for primitive types as PHP has automatic 
typeconversion for them Also we are not adding any checks for primitive 
types since that would either slow down the compile step or would 
require new keywords. (by helly@php.net)

user comment里面提供了利用set_error_handler解决php对int/string类型type hint报fatal error的方法, 但是set_error_handler..这个合适吗? 罢了,php type hint不支持interface, 却支持数组,quick and dirty, 这或许就是php philosophy吧

多层数组和对象转化的用途很简单,便于处理WebService中多层数组和对象的转化
简单的(array)和(object)只能处理单层的数据,对于多层的数组和对象转换则无能为力。
通过json_decode(json_encode($object)可以将对象一次性转换为数组,但是object中遇到非utf-8编码的非ascii字符则会出现问题,比如gbk的中文,何况json_encode和decode的性能也值得疑虑。

下面上代码:


 

	<?php
 
	function objectToArray($d) {
		if (is_object($d)) {
			// Gets the properties of the given object
			// with get_object_vars function
			$d = get_object_vars($d);
		}
 
		if (is_array($d)) {
			/*
			* Return array converted to object
			* Using __FUNCTION__ (Magic constant)
			* for recursive call
			*/
			return array_map(__FUNCTION__, $d);
		}
		else {
			// Return array
			return $d;
		}
	}
 
	function arrayToObject($d) {
		if (is_array($d)) {
			/*
			* Return array converted to object
			* Using __FUNCTION__ (Magic constant)
			* for recursive call
			*/
			return (object) array_map(__FUNCTION__, $d);
		}
		else {
			// Return object
			return $d;
		}
	}

	// Useage:
	// Create new stdClass Object 	
        $init = new stdClass;
	// Add some test data
	$init->foo = "Test data";
	$init->bar = new stdClass;
	$init->bar->baaz = "Testing";
	$init->bar->fooz = new stdClass;
	$init->bar->fooz->baz = "Testing again";
	$init->foox = "Just test";
 
	// Convert array to object and then object back to array
	$array = objectToArray($init);
	$object = arrayToObject($array);
 
	// Print objects and array
	print_r($init);
	echo "\n";
	print_r($array);
	echo "\n";
	print_r($object);
?>