php 去除文件BOM头

用程序进行递归文件夹目录达到清除所有的文件中的BOM头。将该文件放在项目根目录下面运行一次,即可解决.(之后可删除掉该文件）

 

";
                }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);
}