Detailed explanation of php custom error log examples

php Custom error log

In the project, the defined error log needs to be processed in a timely manner, so you need to modify the output method of the custom error log (writing logs, sending emails, sending text messages )

1. register_shutdown_function(array('phperror','shutdown_function')); //Define the function to be executed after the PHP program is executed

The function can be implemented when A function that is executed after the program execution is completed, and its function is to implement subsequent operations after the program execution is completed. There may be an execution timeout or forced shutdown when the program is running, but the default prompt in this case is very unfriendly. If you use the register_shutdown_function() function to catch exceptions, you can provide a more friendly error display method. At the same time, Follow-up operations of some functions can be implemented, such as temporary data cleaning after completion of execution, including temporary files, etc.

You can understand the calling conditions like this:

1. When the page is forced to stop by the user

2. When the program code runs out of time

3. When When the PHP code execution is completed, there are exceptions, errors, and warnings in the code execution

2. set_error_handler(array('phperror','error_handler')); //Set a user-defined error handling function

　 Set a user-defined error handler through the set_error_handler() function, and then trigger the error (through trigger_error()):

3. set_exception_handler(array('phperror' ,'appException')); //Customized exception handling

Define the data format of exception thrown.

class phperror{
  
  //自定义错误输出方法
  public static function error_handler($errno, $errstr, $errfile, $errline){
    $errtype = self::parse_errortype($errno);
    $ip = $_SERVER['REMOTE_ADDR'];//这里简单的获取客户端IP
    //错误提示格式自定义
    $msg = date('Y-m-d H:i:s')." [$ip] [$errno] [-] [$errtype] [application] {$errstr} in {$errfile}:{$errline}";
    //自定义日志文件的路径
    $logPath = 'logs/app.log';
    //写操作，注意文件大小等控制
    file_put_contents($logPath, $msg, FILE_APPEND);
  }

  //系统运行中的错误输出方法
  public static function shutdown_function(){
    $lasterror = error_get_last();//shutdown只能抓到最后的错误，trace无法获取
    $errtype = self::parse_errortype($lasterror['type']);
    $ip = $_SERVER['REMOTE_ADDR'];//这里简单的获取客户端IP
    //错误提示格式自定义
    $msg = date('Y-m-d H:i:s')." [$ip] [{$lasterror['type']}] [-] [$errtype] [application] {$lasterror['message']} in {$file}:{$lasterror['line']}";
    //自定义日志文件的路径
    $logPath = 'logs/app.log';
    //写操作，注意文件大小等控制
    file_put_contents($logPath, $msg,FILE_APPEND);
  }

　//自定义异常输出

  public static function appException($exception) { 
 　　echo " exception: " , $exception->getMessage(), "/n"; 
  } 
  private static function parse_errortype($type){
    switch($type){
      case E_ERROR: // 1 
        return 'Fatal Error';
      case E_WARNING: // 2 
        return 'Warning';
      case E_PARSE: // 4 
        return 'Parse error';
      case E_NOTICE: // 8 
        return 'Notice';
      case E_CORE_ERROR: // 16 
        return 'Core error';
      case E_CORE_WARNING: // 32 
        return 'Core warning';
      case E_COMPILE_ERROR: // 64 
        return 'Compile error';
      case E_COMPILE_WARNING: // 128 
        return 'Compile warning';
      case E_USER_ERROR: // 256 
        return 'User error';
      case E_USER_WARNING: // 512 
        return 'User warning';
      case E_USER_NOTICE: // 1024 
        return 'User notice';
      case E_STRICT: // 2048 //
        return 'Strict Notice';
      case E_RECOVERABLE_ERROR: // 4096 
        return 'Recoverable Error';
      case E_DEPRECATED: // 8192 
        return 'Deprecated';
      case E_USER_DEPRECATED: // 16384 
        return 'User deprecated';
    }
    return $type;
  }
  
}

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