今天升级项目,发现部署后访问报错,
Session must be started before any output has been sent to the browser; outp
原因是在session_start() 有输出或者其他原因。
这也没法检查啊!!!
后来在网上找到了一段程序,检测并删除BOM的,之后就访问正常了。
原文找不到了
贴出程序以供参考:
<?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 ); }
使用方法:
先备份下一的项目代码:
将以上代码保存到一个文件中(例如a.php),放到webroot下
访问 项目地址/a.php?dir=你的项目目录
浏览器中显示:
会显示出那些文件自动清除了BOM。
访问页面看看正常了吗。