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知识宝典:介绍PHP变量串行化存储格式

Jun 13, 2016 am 11:04 AM
php introduce variable storage Format Compare use Knowledge Research still

PHP还是比较常用的,于是我研究了一下PHP变量串行化,在这里拿出来和大家分享一下,希望对大家有用。串行化大概就是把一些变量转化成为字符串的字节流的形式,这样比较容易传输、存储。当然,关是传输存储没有什么,关键是变成串的形式以后还能够转化回来,而且能够保持原来数据的结构。

串行化大概就是把一些变量转化成为字符串的字节流的形式,这样比较容易传输、存储。当然,关是传输存储没有什么,关键是变成串的形式以后还能够转化回来,而且能够保持原来数据的结构。在PHP中有多串行化处理的函数:serialize(),该函数把任何变量值(除了资源变量)转化为字符串的形式,可以把字符串保存到文件里,或者注册为Session,乃至于使用curl来模拟GET/POST来传输变量,达到RPC的效果。如果要将串行化的变量转化成PHP原始的变量值,那么可以使用unserialize()函数。

PHP变量串行化

我们举简单的例子来说明PHP变量串行化,以及它的存储格式。

整型

<ol class="dp-xml">
<li class="alt"><span><span>$</span><span class="attribute"><font color="#ff0000">var</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">23</font></span><span>;  </span></span></li>
<li class=""><span>echo serialize($var); </span></li>
</ol>
Copy after login

输出:i:23;

浮点型

<ol class="dp-xml">
<li class="alt"><span><span>$</span><span class="attribute"><font color="#ff0000">var</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">1</font></span><span>.23;  </span></span></li>
<li class=""><span>echo serialize($var); </span></li>
</ol>
Copy after login

输出:d:1.229999999999999982236431605997495353221893310546875;

字符串

<ol class="dp-xml">
<li class="alt"><span><span>$</span><span class="attribute"><font color="#ff0000">var</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">"This is a string"</font></span><span>;  </span></span></li>
<li class=""><span>echo serialize($var);  </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">var</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">"我是变量"</font></span><span>;  </span>
</li>
<li class=""><span>echo serialize($var); </span></li>
</ol>
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输出:s:16:"This is a string";s:8:"我是变量";

布尔型

<ol class="dp-xml">
<li class="alt"><span><span>$</span><span class="attribute"><font color="#ff0000">var</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">true</font></span><span>;  </span></span></li>
<li class=""><span>echo serialize($var);  </span></li>
<li class="alt">
<span>$</span><span class="attribute"><font color="#ff0000">var</font></span><span> = </span><span class="attribute-value"><font color="#0000ff">false</font></span><span>;  </span>
</li>
<li class=""><span>echo serialize($var); </span></li>
</ol>
Copy after login

输出:b:1;b:0;

上面这些基本类型串行化之后的情况很清楚,串行化之后的存储格式是:变量类型:[变量长度:]变量值;就是第一位字符代表变量类型,第二个:代表分割,变量长度是可选的,就是在字符串类型里有,其他类型没有,最后一个就是变量值,每个串行化的值以";"作为结束。


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