php写入文件做日志

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public function dump_log(){     $time = date('Y-m-d');     $file = "mac/".$time.".txt";     $f = fopen($file,"a");     fwrite($f,"----------------------$this->cmd---------------------------"."\n");     fwrite($f,"-----imei-----"."\n".$this->imei."\n");     fwrite($f,"-----cmd-----"."\n".$this->cmd."\n");     fwrite($f,"-----data-----"."\n");     ob_start();     print_r(json_decode(htmlspecialchars_decode($this->data)));     $result = ob_get_clean();     fwrite($f,"$result"."\n");     fwrite($f,"-----time-----"."\n".date("Y-m-d H:i:s")."\n\n\n\n");     fclose($f); }