PHP檔案中若有 unicode bom (utf-8 bom) 的時候，執行時出錯，例如：
demo.php
[前方還有一二個隱藏字元，但你看不見]<?php
session_start();
session_start();
執行結果
Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /home/pork/public_html/shop/admin/categories.php:1) in home/user/demo.php on line 2
參考 magicbug at gmail dot com 提供的移除程式
remove_utf8bom.php
<?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)) {
echo "filename: $basedir/$file ".checkBOM("$basedir/$file")." ";
}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, $rest);
return ("BOM found, automatically removed.");
} else {
return ("BOM found.");
}
}
else return ("BOM Not Found.");
}
function rewrite ($filename, $data) {
$filenum = fopen($filename, "w");
flock($filenum, LOCK_EX);
fwrite($filenum, $data);
fclose($filenum);
}
?>
執行
$ php remove_utf8bom.php
這樣就能把目錄下面的所有utf8 bom檔案都「洗掉』。
延伸閱讀
UTF-8 BOM (Byte Order Mark) 的問題
原文 2009-12-11 16:41:45