<?php

//有些php文件由于不小心保存成了含bom头的格式而导致出现一系列的问题。以下是批量清除bom头的代码

if (isset ( $_GET ['dir'] )) { //config the basedir

    $basedir = $_GET ['dir'];

} else {

    $basedir = '.';

}

$basedir=".";    //默认可以是当前的文件夹

$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 );

}