I wrote a PHP function to detect file encoding_PHP tutorial-PHP Tutorial-php.cn

I wrote a PHP function to detect file encoding_PHP tutorial

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Release： 2016-07-13 10:32:03

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Regarding file encoding detection, there are a lot of them on Baidu, but there is really nothing useful.
Many people suggested mb_detect_encoding detection, but for some reason I failed and nothing was output.
I saw someone write I bought an enhanced version and used BOM to judge, but I decisively ignored it. This thing is completely unreliable.
Finally, I wrote a detection function based on the example below the mb_detect_encoding function in the PHP manual.
It also includes automatic The function that detects the encoding and reads the file according to the specified encoding.
The source code is provided. If you don’t like it, please don’t comment.
I wrote this after trying the online method but it didn’t work. Maybe it’s caused by the different environment.
So if it doesn’t work, don’t blame me, I’m just sharing my thoughts.

Copy the code The code is as follows:

/**
* Detect file encoding
* @param string $file file path
* @return string|null return encoding name or null
*/
function detect_encoding($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;
}

/**
* Automatically parse the encoding and read the file
* @param string $file file path
* @param string $charset read the encoding
* @return string return the read content
*/
function auto_read($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 "";
}