php中serialize、unserialize与json_encode、json_decode比较

性能比较

同一个变量编码或解码10000次，每个函数执行10000次所需时间

php5.2.13

json : 190 
serialize : 257 
json_encode : 0.08364200592041 
json_decode : 0.18004894256592 
serialize : 0.063642024993896 
unserialize : 0.086990833282471 
DONE. 

时间

json_decode两倍于unserialize

php5.3.2

json : 190 
serialize : 257 
json_encode : 0.062805891036987 
json_decode : 0.14239192008972 
serialize : 0.048481941223145 
unserialize : 0.05927300453186 
DONE. 

json_decode两倍于unserialize

总之 unserialize 解码速度要更快，在做缓存,编码频繁解码的情况下使用会有更好的效率。

测试代码如下

<?php 
$target = array ( 
    'name' => '全能头盔', 
    'quality' => 'Blue', 
    'ti_id' => 21302, 
    'is_bind' => 1, 
    'demand_conditions' => array ( 
        'HeroLevel' => 1, 
    ), 
    'quality_attr_sign' => array ( 
        'HeroStrength' => 8, 
        'HeroAgility' => 8, 
        'HeroIntelligence' => 8, 
    ), 
); 

$json = json_encode($target); //json_encode编码
$seri = serialize($target); //serialize序列化
echo "json :\t\t" . strlen($json) . "\r\n"; //json_encode后字符串长度
echo "serialize :\t" . strlen($seri) . "\r\n\r\n"; //serialize序列化长度

//---------------------------------- json_encode
$stime = microtime(true); //起始微秒
for ($i = 0; $i < 10000; $i ++){ //10000次
    json_encode($target); 
} 
$etime = microtime(true); //终止微秒
echo "json_encode :\t" . ($etime - $stime) . "\r\n"; //运行时间

//---------------------------------- json_decode
$stime = microtime(true); 
for ($i = 0; $i < 10000; $i ++){ 
    json_decode($json); 
} 
$etime = microtime(true); 
echo "json_decode :\t" . ($etime - $stime) . "\r\n\r\n"; 

//---------------------------------- serialize
$stime = microtime(true); 
for ($i = 0; $i < 10000; $i ++){ 
    serialize($target); 
} 
$etime = microtime(true); 
echo "serialize :\t" . ($etime - $stime) . "\r\n"; 

//---------------------------------- unserialize
$stime = microtime(true); 
for ($i = 0; $i < 10000; $i ++){ 
    unserialize($seri); 
} 
$etime = microtime(true); 
echo "unserialize :\t" . ($etime - $stime) . "\r\n\r\n"; 
echo 'DONE.'; 
?> 

json : 190

serialize : 257

json_encode : 0.052663087844849

json_decode : 0.068554162979126

serialize : 0.023483037948608

unserialize : 0.031199216842651

DONE.