php实现文件编码批量转换

有些问题，不能重复转，比如gbk转到utf8,然后有在转成utf8,这样会乱码，我本来试图在转换之前去检测编码的，貌似失败了。我特意试了一个文件，我检测它是是否是gbk或者是utf-8,都返回true。这就不懂了。

复制代码 代码如下:

/**
* 转换文件编码
* 依赖的扩展filesystem 和 mbstring
* @example
*

 * include_once 'ConvertEncode.php';
 * $convert = new ConvertEncode();
 * try{
 *   $convert->setPath('my', true, true);//目录
 *    //$convert->setPath('my.php');//单文件
 *   $convert->setEncode('GBK', 'UTF-8');
 *   $convert->convert();
 * }catch(ConvertException $e) {
 *   echo $e->getMessage();
 * }
 * 

*/
class ConvertEncode {

/**
* 要转换成的编码
* @var string
*/
private $_to_encoding;

/**
* 转换前的编码
* @var string
*/
private $_from_encoding;

/**
* 要转换的的目录或者单文件
* @var string
*/
private $_path;

/**
* 是否是一个目录，当给出的是目录是才设置
* @var boolean
*/
private $_directory;

/**
* 是否递归遍历，仅对目录有效
* @var boolean
*/
private $_recursion;

/**
* 保存所有待转换的文件，仅当转换目录里面的文件时才用
* @var array
*/
private $_files = array();

/**
* 构造函数
*/
public function __construct() {
if( ! function_exists('mb_convert_encoding') ) {
throw new ConvertException('mbstring extension be required');
}
}

/**
* 设置需要转换的目录或者单文件
* @param string $path 目录或者文件
* @param boolean 是否是目录
* @param boolean 是否递归目录
* @return boolean
*/
public function setPath($path, $is_dir = false, $rec = false) {
$this->_path = $path;
$this->_directory = $is_dir;
$this->_recursion = $rec;
return true;
}

/**
* 设置转换前的编码和要转换到的编码
* @param string $encode 转换前的编码
* @param string $encode 转换到的编码
* @return boolean
*/
public function setEncode($encode_from, $encode_to) {
$this->_from_encoding = $encode_from;
$this->_to_encoding = $encode_to;
return true;
}

/**
* 转换编码，根据是否是目录的设置分别转换
* @return boolean
*/
public function convert() {
if($this->_directory ) {
return $this->_convertDirectory();
}
return $this->_convertFile();
}

/**
* 转换文件
* @throws ConvertException
* @return boolean
*/
private function _convertFile() {
if( ! file_exists($this->_path) ) {
$message = $this->_path . ' does not exist.';
throw new ConvertException($message);
}
if( ! is_file($this->_path) ) {
$message = $this->_path . ' is not a file.';
throw new ConvertException($message);
}
if( ! $this->_isWR() ) {
$message = $this->_path . ' must can be read and write.';
throw new ConvertException($message);
}
$file_real_path = realpath($this->_path);
$file_content_from = file_get_contents( $file_real_path );
if( mb_check_encoding($file_content_from, $this->_from_encoding) ) {
$file_content_to = mb_convert_encoding( $file_content_from, $this->_to_encoding, $this->_from_encoding );
file_put_contents( $file_real_path, $file_content_to );
}
return true;

}

/**
* 转换目录
* @throws ConvertException
* @return boolean
*/
private function _convertDirectory() {
if( ! file_exists($this->_path) ) {
$message = $this->_path . ' does not exist.';
throw new ConvertException($message);
}
if( ! is_dir($this->_path) ) {
$message = $this->_path . ' is not a directory.';
throw new ConvertException($message);
}
if( ! $this->_isWR() ) {
$message = $this->_path . ' must can be read and write.';
throw new ConvertException($message);
}
$this->_scanDirFiles();
if( empty($this->_files) ) {
$message = $this->_path . ' is a empty directory.';
throw new ConvertException($message);
}
foreach( $this->_files as $value ) {
$file_content_from = file_get_contents( $value );
if( mb_check_encoding($file_content_from, $this->_from_encoding) ) {
$file_content_to = mb_convert_encoding( $file_content_from, $this->_to_encoding, $this->_from_encoding );
file_put_contents( $value, $file_content_to );
}
}
return true;
}

/**
* 判断文件或者目录是否可读写
* @return boolean 可读写时返回true,否则返回false
*/
private function _isWR() {
if( is_readable($this->_path) && is_writable($this->_path) ) {
return true;
}
return false;
}

/**
* 遍历目录，找出所有文件，加上绝对路径
* @return boolean
*/
private function _scanDirFiles($dir = '') {
$base_path = empty( $dir ) ? realpath($this->_path) . DIRECTORY_SEPARATOR : realpath($dir) . DIRECTORY_SEPARATOR;
$files_tmp = empty( $dir ) ? scandir($this->_path) : scandir($dir);
foreach( $files_tmp as $value ) {
if( $value == '.' || $value == '..' || ( strpos($value, '.') === 0 ) ) {
continue;
}
$value = $base_path . $value;
if( is_dir($value) ) {
if( $this->_recursion ) {
$this->_scanDirFiles($value);
}
}
elseif( is_file($value) ) {
$this->_files[] = $value;
}
}
return true;
}
}

/**
* 转换异常
*
*/
class ConvertException extends Exception {

}