今天用到PHP的序列化和反序列化，顺便做了个测试。官方手册信息在这里和这里。

我使用的是PHP 5.2.4.4，操作系统是Windows XP，测试总结，如下：

问题

• print unserialize(serialize(false)).$newline;//bug???，这个没有输出（见测试代码输出中的boolean节）
• print unserialize(serialize(NULL)).$newline;//bug???，这个没有输出（见测试代码输出中的NULL节）
• 对中文的处理要注意（见测试代码输出中的string节）
• 对float，double的处理要注意（见测试代码输出中的float,double节）
• 对object的序列化不包含方法（见测试代码输出中的object节）

测试代码

<?php
	
	$newline = "<br/>";
	
	print "---  boolean   ---";
	print $newline;
	//boolean
	print serialize(true).$newline;
	print unserialize(serialize(true)).$newline;
	print $newline;
	print serialize(false).$newline;
	print unserialize(serialize(false)).$newline;//bug???
	
	print $newline;
	print "---  integer   ---";
	print $newline;
	//integer
	print serialize(1).$newline;
	print unserialize(serialize(1)).$newline;
	print $newline;	
	print serialize(-1).$newline;
	print unserialize(serialize(-1)).$newline;
	
	print $newline;
	print "---  float,double   ---";
	print $newline;
	//float,double
	print serialize(1.23).$newline;
	print unserialize(serialize(1.23)).$newline;
	print $newline;	
	print serialize(-1.23).$newline;	
	print unserialize(serialize(-1.23)).$newline;
	
	print $newline;
	print "---  string   ---";
	print $newline;
	//string
	print serialize("hello").$newline;
	print unserialize(serialize("hello")).$newline;
	print $newline;
	print serialize("你好").$newline;
	print unserialize(serialize("你好")).$newline;
	
	print $newline;
	print "---  array   ---";
	print $newline;
	//array
	print serialize(array()).$newline;
	print serialize(array(1=>true,3=>1.23)).$newline;
	print serialize(array(1=>false,
			"foos"=>array(1=>"foo1",2=>"foo2"))).$newline;
	
	print $newline;
	print "---  object   ---";
	print $newline;
	//object
	class Foo{
		var $hi = "hello";
		
		var $name = "world";
		
		function hello(){
			print $this->hi." ".$this->name;
		}
	}
	print serialize(new Foo).$newline;
	
	print $newline;
	print "---  resource   ---";
	print $newline;
	//resource
	print "unsupport".$newline;
	
	print $newline;
	print "---  NULL   ---";
	print $newline;
	//NULL
	print serialize(NULL).$newline;
	print unserialize(serialize(NULL)).$newline;//bug???
	
	print $newline;
	print "---  others   ---";
	print $newline;
	//0
	print serialize(0).$newline;
	print serialize((float)0).$newline;
	print serialize((double)0).$newline;
	
	print $newline;
	//octal
	print serialize(0123).$newline;
	print unserialize(serialize(0123)).$newline;
	//hexadecimal
	print serialize(0x1A).$newline;
	print unserialize(serialize(0x1A)).$newline;
	
	print $newline;
	//NAN,INF
	//NAN The constant NAN is reported as 0 on Windows build   
	//see http://bugs.php.net/bug.php?id=42143
	print serialize(NAN).$newline;
	print unserialize(serialize(NAN)).$newline;
	print serialize(INF).$newline;
	print unserialize(serialize(INF)).$newline;
?>

测试代码输出：

--- boolean ---
b表示boolean，1表示true
b:1;
1

b:0;
<---这里应该有输出，可是没有

--- integer ---
i表示integer，1表示值为1
i:1;
1

i:-1;
-1

--- float,double ---
注意原来是1.23
d表示double同float，后面表示值
d:1.229999999999999982236431605997495353221893310546875;
1.23

d:-1.229999999999999982236431605997495353221893310546875;
-1.23

--- string ---
s表示string，5表示字符串的长度，后面表示实际的字符串
s:5:"hello";
hello

注意原来的你好成了乱码，这里我把乱码替换掉了
s:6:"变成了乱码";
变成了乱码

--- array ---
a表示array，0表示数组长度
a:0:{}
a:2:{i:1;b:1;i:3;d:1.229999999999999982236431605997495353221893310546875;}
a:2:{i:1;b:0;s:4:"foos";a:2:{i:1;s:4:"foo1";i:2;s:4:"foo2";}}

--- object ---
O(大写)表示array，3表示Foo的长度，2表示数组的长度
这里可以窥探PHP是如何序列化对象的
O:3:"Foo":2:{s:2:"hi";s:5:"hello";s:4:"name";s:5:"world";}

--- resource ---
unsupport

--- NULL ---
N;
<---这里应该有输出，可是没有

--- others ---
integer 0
i:0;
float 0
d:0;
double 0
d:0;

看不出是八进制了
i:83;
83
看不出是十进制了
i:26;
26

d:0;
0
d:INF;
INF