<?phpclass Tool {  public static function log($info) {    $time = date('m-d H:i:s');    $backtrace = debug_backtrace();    $backtrace_line = array_shift($backtrace); // 哪一行調用的log方法    $backtrace_call = array_shift($backtrace); // 誰調用的log方法    $file = substr($backtrace_line['file'], strlen($_SERVER['DOCUMENT_ROOT']));    $line = $backtrace_line['line'];    $class = isset($backtrace_call['class']) ? $backtrace_call['class'] : '';    $type = isset($backtrace_call['type']) ? $backtrace_call['type'] : '';    $func = $backtrace_call['function'];    file_put_contents($_SERVER['DOCUMENT_ROOT'].'/debug.log', "$time $file:$line $class$type$func: $info/n", FILE_APPEND);  }}class Action {  public function a() {    $this->b();  }  public function b() {    $this->c();  }  public function c() {    Tool::log('sdfsdf');  }}$action = new Action();$action->a();

function loginfo($format) {  $args = func_get_args();  array_shift($args);  $d = debug_backtrace(DEBUG_BACKTRACE_PROVIDE_OBJECT, 1)[0];  $info = vsprintf($format, $args);  $data = sprintf("%s %s,%d: %s/n", date("Ymd His"), $d["file"], $d["line"], $info);  file_put_contents(__DIR__."/log.txt", $data, FILE_APPEND);}