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php中隐形字符65279(utf-8的BOM头)问题

Jun 06, 2016 pm 08:19 PM
php utf-8

这篇文章主要介绍了php中隐形字符65279问题解决方法,其实就是utf-8文件的BOM头,本文给出了一个删除PHP文件BOM头的小程序,需要的朋友可以参考下

今天在CSDN看到一个php输出空白隐形字符65279的问题,在网上找了下,发下这个65279字符是php用来标记文件是utf-8编码的,输出的时候会一起输出到客户端,导致客户端如果使用ajax得到返回值时,无法匹配字符串。

php隐形字符65279解释如下:

UTF-8 编码的文件可以分为无 BOM 和 BOM 两种格式。

何谓BOM?

  "EF BB BF" 这三个字节就叫BOM,全称是"Byte Order Mard"。在utf8文件中常用BOM来表明这个文件是UTF-8文件,而BOM的本意是在utf16中用。

  utf-8文件在php中输出的时候bom是会被输出的,所以要在php中使用utf-8,必须要是使用不带bom头的utf-8文件。

  常用的文本编辑软件对utf-8文件保存的支持方式并不一样,使用的时候要特别留意。

例如:

1、使用ultraedit时,另存时会有“UTF-8”和“UTF-8 - 无BOM”两种选择。
2、 window的记事本保存的是带bom的。
3、EditPlus软件不同版本对utf-8的保存支持不一样,例如:2.31版本保存的是不带bom的,,2.11版本保存的是带bom的。

把utf-8文件头去掉的办法:

1、使用ultraedit另存,选择“UTF-8 - 无BOM”
2、一个很有用的php程序,放在站点根目录下运行,会把目录下全部utf-8文件的bom头去掉,代码如下:

//remove the utf-8 boms //by magicbug at gmail dot com if (isset($_GET['dir'])){ //config the basedir $basedir=$_GET['dir']; }else{ $basedir = '.'; } $auto = 1; checkdir($basedir); function checkdir($basedir){ if ($dh = opendir($basedir)) { while (($file = readdir($dh)) !== false) { if ($file != '.' && $file != '..'){ if (!is_dir($basedir."/".$file)) { echo "filename $basedir/$file ".checkBOM("$basedir/$file")."
"; }else{ $dirname = $basedir."/".$file; checkdir($dirname); } } } closedir($dh); } } function checkBOM ($filename) { global $auto; $contents = file_get_contents($filename); $charset[1] = substr($contents, 0, 1); $charset[2] = substr($contents, 1, 1); $charset[3] = substr($contents, 2, 1); if (ord($charset[1]) == 239 && ord($charset[2]) == 187 && ord($charset[3]) == 191) { if ($auto == 1) { $rest = substr($contents, 3); rewrite ($filename, $rest); return ("BOM found, automatically removed."); } else { return ("BOM found."); } } else return ("BOM Not Found."); } function rewrite ($filename, $data) { $filenum = fopen($filename, "w"); flock($filenum, LOCK_EX); fwrite($filenum, $data); fclose($filenum); }

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