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");