[PHP知识库]PHP清理bom文件头

<?php

header("Content-type: text/html; charset=utf-8");
$basedir = '.';

$auto = 1;

checkdir($basedir);
echo '<br />验证完毕，如果没有红色文件证明一切正常！';
function checkdir($basedir){
?? ?if($dh = opendir($basedir)) {
?? ??? ?while(($file = readdir($dh)) !== false) {
?? ??? ??? ?if($file != '.' && $file != '..' && $file != '.svn'){
?? ??? ??? ??? ?if(!is_dir($basedir."/".$file)) {
?? ??? ??? ??? ??? ?if(checkBOM("$basedir/$file")==1){
?? ??? ??? ??? ??? ??? ?echo "filename: $basedir/$file <font color=red>存在，自动删除.</font> <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($contents, 3);
?? ??? ??? ?@file_put_contents($filename, $rest, LOCK_EX);
?? ??? ??? ?return 1;
?? ??? ?} else {
?? ??? ??? ?return 0;
?? ??? ?}
?? ?}
?? ?else return("不存在");
}
?>