/ufeff，php解决方案

<?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" ) . " <br>";
} 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 ("<font color=red>BOM found, automatically removed.</font>");
} else {
return ("<font color=red>BOM found.</font>");
}
} else
return ("BOM Not Found.");
}

function rewrite($filename, $data) {
$filenum = fopen ( $filename, "w" );
flock ( $filenum, LOCK_EX );
fwrite ( $filenum, $data );
fclose ( $filenum );
}