读取文件夹下所有文件内容

if (is_dir($dir)) {if ($dh = opendir($dir)){while (($file = readdir($dh)) !== false){        if(filetype($dir.$file)=="file"){         tail("statistics/{$file}"); } } closedir($dh);}}function tail($file){     $fp = fopen($file, "r");     $data = "";     while (TRUE) {$t = null;$data=null;while ($t != "\n") {        $t = fgetc($fp);        if($t === FALSE) break 2;        $data .= $t;  }    $data .= $t;    echo $data;}fclose ($fp);}