php检测文件编码的方法
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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