早先的php教程中，我们提到过关于用php判断文件是否是utf-8编码(并检查bom)的例子，今天我们再来实现一下php 删除 utf-8 bom，费话少说直接上代码：
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引用的内容：[www.bkjia.com]
//查找utf-8 BOM问题 if(isset($_GET['dir'])){
$basedir=$_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, $rest);
return("存在，自动删除.");
} else {
return("不存在");
}
}
else return("不存在");
}
function rewrite($filename, $data) {
$filenum = fopen($filename, "w");
flock($filenum, LOCK_EX);
fwrite($filenum, $data);
fclose($filenum);
}
?>
