Detect whether the file has BOM header - PHP_PHP Tutorial

<?
//此文件用于快速测试UTF8编码的文件是不是加了BOM，并可自动移除
//By Bob Shen
 
$basedir="."; //修改此行为需要检测的目录，点表示当前目录
$auto=1; //是否自动移除发现的BOM信息。1为是，0为否。
 
//以下不用改动
 
if ($dh = opendir($basedir)) {
while (($file = readdir($dh)) !== false) {
if ($file!=&#39;.&#39; && $file!=&#39;..&#39; && !is_dir($basedir."/".$file)) echo "filename: $file ".checkBOM("$basedir/$file")." <br>";
}
closedir($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>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);
}

http://www.bkjia.com/PHPjc/444550.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/444550.htmlTechArticle?//This file is used to quickly test whether the UTF8 encoded file has a BOM added and can be automatically removed //By Bob Shen $basedir=.; //Modify the directory that needs to be detected for this behavior. The dot indicates the current directory $aut...