php 版本处理类
例如记录app版本，或某些版本数据，如果使用1.0.0这种版本格式记录入库，在需要筛选查询时会比较麻烦。
而把版本字符串转为数字保存，可以方便版本间的比较和筛选。
例如：要查询3.0.1 与 10.0.1之间的版本，因为3.0.1比10.0.1大(字符串比较)，因此需要处理才可以查询。
而把 3.0.1 和 10.0.1 先转为数字 30001 和 100001来比较查询，则很方便。
Version.class.php
<code><span><span><?php </span><span>/**
* 版本处理类，提供版本与数字互相转换，方便入库后进行比较筛选
* Date: 2015-06-30
* Author: fdipzone
* ver: 1.0
*
* Func:
* public version_to_integer 将版本转为数字
* public integer_to_version 将数字转为版本
* public check 检查版本格式是否正确
* public compare 比较两个版本的值
*/</span><span><span>class</span><span>Version</span>{</span><span>// class start</span><span>/**
* 将版本转为数字
*<span> @param</span> String $version 版本
*<span> @return</span> Int
*/</span><span>public</span><span><span>function</span><span>version_to_integer</span><span>(<span>$version</span>)</span>{</span><span>if</span>(<span>$this</span>->check(<span>$version</span>)){
<span>list</span>(<span>$major</span>, <span>$minor</span>, <span>$sub</span>) = explode(<span>'.'</span>, <span>$version</span>);
<span>$integer_version</span> = <span>$major</span>*<span>10000</span> + <span>$minor</span>*<span>100</span> + <span>$sub</span>;
<span>return</span> intval(<span>$integer_version</span>);
}<span>else</span>{
<span>throw</span><span>new</span> ErrorException(<span>'version Validate Error'</span>);
}
}
<span>/**
* 将数字转为版本
*<span> @param</span> Int $version_code 版本的数字表示
*<span> @return</span> String
*/</span><span>public</span><span><span>function</span><span>integer_to_version</span><span>(<span>$version_code</span>)</span>{</span><span>if</span>(is_numeric(<span>$version_code</span>) && <span>$version_code</span>>=<span>10000</span>){
<span>$version</span> = <span>array</span>();
<span>$version</span>[<span>0</span>] = (int)(<span>$version_code</span>/<span>10000</span>);
<span>$version</span>[<span>1</span>] = (int)(<span>$version_code</span>%<span>10000</span>/<span>100</span>);
<span>$version</span>[<span>2</span>] = <span>$version_code</span>%<span>100</span>;
<span>return</span> implode(<span>'.'</span>, <span>$version</span>);
}<span>else</span>{
<span>throw</span><span>new</span> ErrorException(<span>'version code Validate Error'</span>);
}
}
<span>/**
* 检查版本格式是否正确
*<span> @param</span> String $version 版本
*<span> @return</span> Boolean
*/</span><span>public</span><span><span>function</span><span>check</span><span>(<span>$version</span>)</span>{</span><span>$ret</span> = preg_match(<span>'/^[0-9]{1,3}\.[0-9]{1,2}\.[0-9]{1,2}$/'</span>, <span>$version</span>);
<span>return</span><span>$ret</span>? <span>true</span> : <span>false</span>;
}
<span>/**
* 比较两个版本的值
*<span> @param</span> String $version1 版本1
*<span> @param</span> String $version2 版本2
*<span> @return</span> Int -1:12
*/</span><span>public</span><span><span>function</span><span>compare</span><span>(<span>$version1</span>, <span>$version2</span>)</span>{</span><span>if</span>(<span>$this</span>->check(<span>$version1</span>) && <span>$this</span>->check(<span>$version2</span>)){
<span>$version1_code</span> = <span>$this</span>->version_to_integer(<span>$version1</span>);
<span>$version2_code</span> = <span>$this</span>->version_to_integer(<span>$version2</span>);
<span>if</span>(<span>$version1_code</span>><span>$version2_code</span>){
<span>return</span><span>1</span>;
}<span>elseif</span>(<span>$version1_code</span>$version2_code</span>){
<span>return</span> -<span>1</span>;
}<span>else</span>{
<span>return</span><span>0</span>;
}
}<span>else</span>{
<span>throw</span><span>new</span> ErrorException(<span>'version1 or version2 Validate Error'</span>);
}
}
} <span>// class end</span><span>?></span></span></code>登录后复制
demo.php
<code><span><?php </span><span>require</span><span>'Version.class.php'</span>;
<span>$version</span> = <span>'2.7.1'</span>;
<span>$obj</span> = <span>new</span> Version();
<span>// 版本转数字</span><span>$version_code</span> = <span>$obj</span>->version_to_integer(<span>$version</span>);
<span>echo</span><span>$version_code</span>.<span>'<br>'</span>; <span>// 20701</span><span>// 数字转版本</span><span>$version</span> = <span>$obj</span>->integer_to_version(<span>$version_code</span>);
<span>echo</span><span>$version</span>.<span>'<br>'</span>; <span>// 2.7.1</span><span>// 检查版本</span><span>$version</span> = <span>'1.1.a'</span>;
var_dump(<span>$obj</span>->check(<span>$version</span>)); <span>// false</span><span>// 比较两个版本</span><span>$version1</span> = <span>'2.9.9'</span>;
<span>$version2</span> = <span>'10.0.1'</span>;
<span>$result</span> = <span>$obj</span>->compare(<span>$version1</span>, <span>$version2</span>);
<span>echo</span><span>$result</span>; <span>// -1</span><span>?></span></span></code>
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以上就介绍了php 版本处理类，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。
