php序列化serialize() 与反序列化unserialize()

在php中，可以对数组，变量，对象等进行序列化（静态变量，常量不会被序列化）

<?php
    class TestSerialize{
        private $name;
        private $password;
        const ID = 1234;
        public static $_class_name = __CLASS__;
 
        public function __set($varname,$value){
 
            $this->$varname = $value;
        }
 
        public function __get($varname)
        {
            return $this->$varname;
        }
    }
 
    $data = array(
            &#39;name&#39;=>&#39;zhangsan&#39;,
            &#39;password&#39;=>&#39;pwd123&#39;
        );
     
     
    $test = &#39;abcd&#39;;
    $ts = new TestSerialize();
    $ts->name = &#39;zhangsan_2&#39;;
    $ts->password = &#39;pwd123_2&#39;;
    echo  &#39;var=>&#39;.serialize($test).&#39;<br/>&#39;;
    echo  &#39;array=>&#39;.serialize($data).&#39;<br/>&#39;;
    echo  &#39;object=>&#39;.serialize($ts).&#39;<br/>&#39;;
 
?>

输出结果

var=>s:4:"abcd";
array=>a:2:{s:4:"name";s:8:"zhangsan";s:8:"password";s:6:"pwd123";}
object=>O:13:"TestSerialize":2:{s:19:"TestSerializename";s:10:"zhangsan_2";s:23:"TestSerializepassword";s:8:"pwd123_2";}

序列化产生的数据可以保存在本地文件中，也可以进行网络传输

function writeObject($filename,$data='')
{
    if(!file_exists(dirname(__FILE__).'/tmp/'))
    {
        mkdir(dirname(__FILE__).'/tmp/');
    }
    $fp = fopen ( dirname(__FILE__).'/tmp/'.$filename, "w+" );
    if (flock($fp, LOCK_EX )) //给文件加锁
    {
        fwrite($fp, $data );
        flock( $fp, LOCK_UN ); //给文件解锁
    } else {
        echo 'Couldn\'t lock the file !';
    }
    fclose ( $fp );
}
 
function readObject($filename)
{
    if(file_exists(dirname(__FILE__).'/tmp/'.$filename))
    {
        $fp = fopen ( dirname(__FILE__).'/tmp/'.$filename, "r" );
        stream_set_timeout($fp,2);
        $contents = fread($fp, filesize(dirname(__FILE__).'/tmp/'.$filename));
        fclose ($fp);
 
        return $contents;
    }
     
    return NULL;
}

测试一下

writeObject('data.txt',serialize($data));
writeObject('array.txt',serialize($test));
writeObject('object.txt',serialize($ts));
 
echo readObject('data.txt');
echo readObject('data.txt');
echo readObject('data.txt');

打印结果

a:2:{s:4:"name";s:8:"zhangsan";s:8:"password";s:6:"pwd123";}s:4:"abcd";O:13:"TestSerialize":2:{s:19:"TestSerializename";s:10:"zhangsan_2";s:23:"TestSerializepassword";s:8:"pwd123_2";}

为了保证持久化的有效性，我们可以对从数据库读取出来的文件反序列化

$f_data =  readObject('data.txt');
$f_array =  readObject('array.txt');
$f_object =  readObject('object.txt');
 
$d = unserialize($f_data);
 
$a = unserialize($f_array);
 
$u = unserialize($f_object);
 
print_r($d);
echo &#39;<br/>&#39;;
echo $a;
echo &#39;<br/>&#39;;
echo $u->name;

输出结果

Array ( [name] => zhangsan [password] => pwd123 ) 
abcd
zhangsan_2

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