核心代码

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."); }

php清除莫明输出大法,用于输出图片前把前面所有输出清空

只要在header前连用两个函数，就可以解决...

ob_get_clean(); ob_clean(); header("Content-type: image/jpeg");

附几个好用的BOM检测工具：

BOM检测.zip