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在Windows下用记事本之类的程序将文本文件保存为UTF-8格式时，记事本会在文件头前面加上几个不可见的字符（EF BB BF），就是所谓的BOM（Byte order Mark）
<?php
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)) {
// 如果是文件
echo "filename: $basedir/$file " . checkBOM("$basedir/$file") . "
";
} else {
$dirname = $basedir . "/" . $file; // 如果是目录
checkdir($dirname); // 递归
}
}
}
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($charset[3]) == 191) {
// BOM
// 的前三个字符的ASCII
// 码分别为
// 239
// 187
// 191
if ($auto == 1) {
$rest = substr($contents, 3);
rewrite($filename, $rest);
return ("");
} else {
return ("");
}
} else {
return ("BOM Not Found.");
}
}
function rewrite($filename, $data)
{
$filenum = fopen($filename, "w");
flock($filenum, LOCK_EX);
fwrite($filenum, $data);
fclose($filenum);
}
