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:
1 2 3 4 | <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( $var ); </span></li>
</ol>
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输出:i:23;
浮点型:
1 2 3 4 | <ol class = "dp-xml" >
<li class = "alt" ><span><span>$</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( $var ); </span></li>
</ol>
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输出:d:1.229999999999999982236431605997495353221893310546875;
字符串:
1 2 3 4 5 6 7 8 | <ol class = "dp-xml" >
<li class = "alt" ><span><span>$</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( $var ); </span></li>
</ol>
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输出:s:16:"This is a string";s:8:"我是变量";
布尔型:
1 2 3 4 5 6 7 8 | <ol class = "dp-xml" >
<li class = "alt" ><span><span>$</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>
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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。