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

<"htmlcode">

##把该文件放在需求去除BOM头的目录下跑一下却可。
<"/" . $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 );
}
"htmlcode">

#!/usr/bin/env python
#-*- coding: utf-8 -*-

import os

def delBOM():
 file_count = 0
 bom_files = []

 for dirpath, dirnames, filenames in os.walk('.'):
 if(len(filenames)):
  for filename in filenames:
  file_count += 1
  file = open(dirpath + "/" + filename, 'r+')
  file_contents = file.read()

  if(len(file_contents) &gt; 3):
   if(ord(file_contents[0]) == 239 and ord(file_contents[1]) == 187 and ord(file_contents[2]) == 191):
   bom_files.append(dirpath + "/" + filename)
   file.seek(0)
   file.write(file_contents[3:])
   print bom_files[-1], "BOM found. Deleted."
  file.close()

 print file_count, "file(s) found.", len(bom_files), "file(s) have a bom. Deleted."

if __name__ == "__main__":
 delBOM()


为了方便大家使用，这里小编分享一个BOM工具方便大家检测。
下载地址：https://www.jb51.net/softs/496779.html