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。
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>
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>
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>
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>
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。