使用php清除bom示例

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