php基于自定义函数记录log日志方法

/** * 记录错误日志 * @param 日志内容 $res */function save_log($res) {  $err_date = date("Ym", time());  //$address = '/var/log/error';  $address = './error';  if (!is_dir($address)) {    mkdir($address, 0700, true);  }  $address = $address.'/'.$err_date . '_error.log';  $error_date = date("Y-m-d H:i:s", time());  if(!empty($_SERVER['HTTP_REFERER'])) {    $file = $_SERVER['HTTP_REFERER'];  } else {    $file = $_SERVER['REQUEST_URI'];  }  if(is_array($res)) {    $res_real = "$error_date/t$file/n";    error_log($res_real, 3, $address);    $res = var_export($res,true);    $res = $res."/n";    error_log($res, 3, $address);  } else {    $res_real = "$error_date/t$file/t$res/n";    error_log($res_real, 3, $address);  }}

$var =var_export(array('a','b',array('aa','bb','cc')),TRUE)

echo $var;