error php中使用自定义错误处理

<?php
error_reporting(E_ALL);
function ErrHandler($errorno, $errorstr, $errorfile, $errorline) 
{
   $display = true;
   $notify = false;
   $halt_script = false;
   $error_msg = "<br>The $errorno error is occurring at $errorline in
   $errorfile<br>";
   switch($errorno) 
   {
      case E_USER_NOTICE:
      case E_NOTICE:
      $halt_script = false;
      $notify = true;
      $label = "<B>Notice</B>";
      break;
      case E_USER_WARNING:
      case E_WARNING:
      $halt_script = false;
      $notify = true;
      $label = "<b>Warning</b>";
      break;
      case E_USER_ERROR:
      case E_ERROR:
      $label = "<b>Fatal Error</b>";
      $notify=true;
      $halt_script = false;
      break;
      case E_PARSE:
      $label = "<b>Parse Error</b>";
      $notify=true;
      $halt_script = true;
      break;
      default:
      $label = "<b>Unknown Error</b>";
      break;
   }
   if($notify)
    {
      $msg = $label . $error_msg;
      echo $msg;
   }
   if($halt_script) exit -1;
}
$error_handler = set_error_handler("ErrHandler");
echo "<BR><H2>Using Custom Error Handler</h2><BR>";
trigger_error("<BR>Error caused by E_USER_NOTICE</BR>", E_USER_NOTICE);
trigger_error("<BR>Error caused by E_USER_WARNING</BR>", E_USER_WARNING);
trigger_error("<BR>Error caused by E_USER_ERROR</BR>", E_USER_ERROR);
trigger_error("<BR>Error caused by E_PARSE</BR>", E_PARSE);
?>