PHP批量删除、清除UTF-8文件BOM头的代码实例

记得运行代码前先把文件备份一下哦，避免出现失败问题。

代码一：

  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.");
  }

代码二：

<?php
header('content-type: text/html; charset=utf-8');
if(isset($_get['dir'])){ //设置文件目录，如果没有设置，则自动设置为当前文件所在目录
  $basedir=$_get['dir'];
}else{
  $basedir='.';
}
$auto=1;/*设置为1标示检测bom并去除，设置为0标示只进行bom检测，不去除*/

echo '当前查找的目录为：'.$basedir.'当前的设置是：';
echo $auto?'检测文件bom同时去除检测到bom文件的bom<br />':'只检测文件bom不执行去除bom操作<br />';

checkdir($basedir);
function checkdir($basedir){
  if($dh=opendir($basedir)){
    while (($file=readdir($dh)) !== false){
      if($file != '.' && $file != '..'){
        if(!is_dir($basedir.'/'.$file)){
          echo '文件: '.$basedir.'/'.$file .checkbom($basedir.'/'.$file).' <br>';
        }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 (' <font color=red>找到bom并已自动去除</font>');
    }else{
      return (' <font color=red>找到bom</font>');
    }
  }else{
    return (' 没有找到bom');
  }
}
function rewrite($filename,$data){
  $filenum=fopen($filename,'w');
  flock($filenum,lock_ex);
  fwrite($filenum,$data);
  fclose($filenum);
}
?>

代码三：

##把该文件放在需求去除bom头的目录下跑一下却可。
<?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 );
}
?>

二、python

#!/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) > 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。

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