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php检测文件编码的方法

Jun 13, 2016 am 09:37 AM
php one but about document method Detection use Baidu of coding

 关于文件编码的检测,百度一下一大把都是,但是确实没有能用的、很多人建议 mb_detect_encoding 检测,可是不知为何我这不成功,什么都没输出、看到有人写了个增强版,用 BOM 判断的,我果断就无视了,这东西完全不靠谱、最终根据PHP手册里 mb_detect_encoding 函数下方的例子,自己写了一个检测函数,

还包括自动检测编码并按指点编码读取文件的函数、源码献上。

复制代码 代码如下:

 /**

* 检测文件编码

 * @param string $file 文件路径

* @return string|null 返回 编码名 或 null

*/

 function detect_encoding($file) {

     $list = array('GBK', 'UTF-8', 'UTF-16LE', 'UTF-16BE', 'ISO-8859-1');

     $str = file_get_contents($file);

     foreach ($list as $item) {

         $tmp = mb_convert_encoding($str, $item, $item);

         if (md5($tmp) == md5($str)) {

             return $item;

         }

     }

     return null;

}

 

/**

* 自动解析编码读入文件

* @param string $file 文件路径

* @param string $charset 读取编码

* @return string 返回读取内容

*/

function auto_read($file, $charset='UTF-8') {

    $list = array('GBK', 'UTF-8', 'UTF-16LE', 'UTF-16BE', 'ISO-8859-1');

     $str = file_get_contents($file);

     foreach ($list as $item) {

        $tmp = mb_convert_encoding($str, $item, $item);

        if (md5($tmp) == md5($str)) {

             return mb_convert_encoding($str, $charset, $item);

         }

     }

    return "";

}

 

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