用PHP解决万恶的BOM

[php]
<?php
$path = dirname(__FILE__);

scandDir($path);

function bomtoutf8($filename)
{
    $ef = 239;
    $bb = 187;
    $bf = 191;

    if (is_dir($filename)) return;
    $fd = fopen($filename, "rb");
    if (!$fd) exit($filename);
    $headers = fread($fd, 3);
    fclose($fd);

    if (strlen($headers) < 3) return;

    if (ord($headers[0]) == $ef &&
        ord($headers[1]) == $bb &&
        ord($headers[2]) == $bf
        ) {
        echo $filename, "\n";
        $content = file_get_contents($filename);
        if (!$content) {
            exit("file get contents failed");
        }
        $len = strlen($content);
        $content = substr($content, 3);

        if ($content === false && $len!=3) {
            exit("sbustr failed");
        } else if ($content === false && $len==3){
            $content = "";
        }
        $ret = file_put_contents($filename, $content, LOCK_EX);
        if ($ret === false) {
            exit("file put contents failed");
        }
        echo "successed file ", $filename, "\n";
    }

}

function scandDir($path)
{
    $d = dir($path);
    if (!$d) exit("dir failed");

    while (false !== ($entry = $d->read())) {
        if ($entry == '.' || $entry == '..') {
            continue;
        }
        $filename = $path . DIRECTORY_SEPARATOR . $entry;
    // echo $filename, "\n";
        if (is_dir($filename)) {
            scandDir($filename);
        } else {
            bomtoutf8($filename);
        }
    }
}

<?php
$path = dirname(__FILE__);

scandDir($path);

function bomtoutf8($filename)
{
$ef = 239;
$bb = 187;
$bf = 191;

if (is_dir($filename)) return;
$fd = fopen($filename, "rb");
if (!$fd) exit($filename);
$headers = fread($fd, 3);
fclose($fd);

if (strlen($headers) < 3) return;

if (ord($headers[0]) == $ef &&
  ord($headers[1]) == $bb &&
  ord($headers[2]) == $bf
  ) {
  echo $filename, "\n";
  $content = file_get_contents($filename);
  if (!$content) {
   exit("file get contents failed");
  }
  $len = strlen($content);
  $content = substr($content, 3);

  if ($content === false && $len!=3) {
   exit("sbustr failed");
  } else if ($content === false && $len==3){
   $content = "";
  }
  $ret = file_put_contents($filename, $content, LOCK_EX);
  if ($ret === false) {
   exit("file put contents failed");
  }
  echo "successed file ", $filename, "\n";
}

}

function scandDir($path)
{
$d = dir($path);
if (!$d) exit("dir failed");

while (false !== ($entry = $d->read())) {
  if ($entry == '.' || $entry == '..') {
   continue;
  }
  $filename = $path . DIRECTORY_SEPARATOR . $entry;
// echo $filename, "\n";
  if (is_dir($filename)) {
   scandDir($filename);
  } else {
   bomtoutf8($filename);
  }
}
}

友情提示：代码是批量处理目录下（包括子目录）的所有带BOM文件，使用前需备份

补充：Web开发 , php ,