一个显示效果非常不错的PHP错误、异常处理类

// 自定义异常函数
set_exception_handler('handle_exception');

// 自定义错误函数
set_error_handler('handle_error');

/**
 * 异常处理
 *
 * @param mixed $exception 异常对象
 * @author blog.snsgou.com
 */
function handle_exception($exception) {
 error::exceptionerror($exception);
}

/**
 * 错误处理
 *
 * @param string $errno 错误代码
 * @param string $errstr 错误信息
 * @param string $errfile 出错文件
 * @param string $errline 出错行
 * @author blog.snsgou.com
 */
function handle_error($errno, $errstr, $errfile, $errline) {
 if ($errno) {
  error::systemerror($errstr, false, true, false);
 }
}

/**
 * 系统错误处理
 *
 * @author blog.snsgou.com
 */
class error {

 public static function systemerror($message, $show = true, $save = true, $halt = true) {

  list($showtrace, $logtrace) = self::debugbacktrace();

  if ($save) {
   $messagesave = '<b>' . $message . '</b><br /><b>php:</b>' . $logtrace;
   self::writeerrorlog($messagesave);
  }

  if ($show) {
   self::showerror('system', "<li>$message</li>", $showtrace, 0);
  }

  if ($halt) {
   exit();
  } else {
   return $message;
  }
 }

 /**
  * 代码执行过程回溯信息
  *
  * @static
  * @access public
  */
 public static function debugbacktrace() {
  $skipfunc[] = 'error->debugbacktrace';

  $show = $log = '';
  $debugbacktrace = debug_backtrace();
  ksort($debugbacktrace);
  foreach ($debugbacktrace as $k => $error) {
   if (!isset($error['file'])) {
    // 利用反射api来获取方法/函数所在的文件和行数
    try {
     if (isset($error['class'])) {
      $reflection = new reflectionmethod($error['class'], $error['function']);
     } else {
      $reflection = new reflectionfunction($error['function']);
     }
     $error['file'] = $reflection->getfilename();
     $error['line'] = $reflection->getstartline();
    } catch (exception $e) {
     continue;
    }
   }

   $file = str_replace(site_path, '', $error['file']);
   $func = isset($error['class']) ? $error['class'] : '';
   $func .= isset($error['type']) ? $error['type'] : '';
   $func .= isset($error['function']) ? $error['function'] : '';
   if (in_array($func, $skipfunc)) {
    break;
   }
   $error['line'] = sprintf('%04d', $error['line']);

   $show .= '<li>[line: ' . $error['line'] . ']' . $file . '(' . $func . ')</li>';
   $log .= !empty($log) ? ' -> ' : '';
   $log .= $file . ':' . $error['line'];
  }
  return array($show, $log);
 }

 /**
  * 异常处理
  *
  * @static
  * @access public
  * @param mixed $exception
  */
 public static function exceptionerror($exception) {
  if ($exception instanceof dbexception) {
   $type = 'db';
  } else {
   $type = 'system';
  }
  if ($type == 'db') {
   $errormsg = '(' . $exception->getcode() . ') ';
   $errormsg .= self::sqlclear($exception->getmessage(), $exception->getdbconfig());
   if ($exception->getsql()) {
    $errormsg .= '<div class="sql">';
    $errormsg .= self::sqlclear($exception->getsql(), $exception->getdbconfig());
    $errormsg .= '</div>';
   }
  } else {
   $errormsg = $exception->getmessage();
  }
  $trace = $exception->gettrace();
  krsort($trace);
  $trace[] = array('file' => $exception->getfile(), 'line' => $exception->getline(), 'function' => 'break');
  $phpmsg = array();
  foreach ($trace as $error) {
   if (!empty($error['function'])) {
    $fun = '';
    if (!empty($error['class'])) {
     $fun .= $error['class'] . $error['type'];
    }
    $fun .= $error['function'] . '(';
    if (!empty($error['args'])) {
     $mark = '';
     foreach ($error['args'] as $arg) {
      $fun .= $mark;
      if (is_array($arg)) {
       $fun .= 'array';
      } elseif (is_bool($arg)) {
       $fun .= $arg ? 'true' : 'false';
      } elseif (is_int($arg)) {
       $fun .= (defined('site_debug') && site_debug) ? $arg : '%d';
      } elseif (is_float($arg)) {
       $fun .= (defined('site_debug') && site_debug) ? $arg : '%f';
      } else {
       $fun .= (defined('site_debug') && site_debug) ? '\'' . htmlspecialchars(substr(self::clear($arg), 0, 10)) . (strlen($arg) > 10 ? ' ...' : '') . '\'' : '%s';
      }
      $mark = ', ';
     }
    }
    $fun .= ')';
    $error['function'] = $fun;
   }
   if (!isset($error['line'])) {
    continue;
   }
   $phpmsg[] = array('file' => str_replace(array(site_path, '\\'), array('', '/'), $error['file']), 'line' => $error['line'], 'function' => $error['function']);
  }
  self::showerror($type, $errormsg, $phpmsg);
  exit();
 }

 /**
  * 记录错误日志
  *
  * @static
  * @access public
  * @param string $message
  */
 public static function writeerrorlog($message) {

  return false; // 暂时不写入

  $message = self::clear($message);
  $time = time();
  $file = log_path . '/' . date('y.m.d') . '_errorlog.php';
  $hash = md5($message);

  $userid = 0;
  $ip = get_client_ip();

  $user = '<b>user:</b> userid=' . intval($userid) . '; ip=' . $ip . '; rip:' . $_server['remote_addr'];
  $uri = 'request: ' . htmlspecialchars(self::clear($_server['request_uri']));
  $message = "<?php exit;?>\t{$time}\t$message\t$hash\t$user $uri\n";

  // 判断该$message是否在时间间隔$maxtime内已记录过，有，则不用再记录了
  if (is_file($file)) {
   $fp = @fopen($file, 'rb');
   $lastlen = 50000;  // 读取最后的 $lastlen 长度字节内容
   $maxtime = 60 * 10;  // 时间间隔：10分钟
   $offset = filesize($file) - $lastlen;
   if ($offset > 0) {
    fseek($fp, $offset);
   }
   if ($data = fread($fp, $lastlen)) {
    $array = explode("\n", $data);
    if (is_array($array))
     foreach ($array as $key => $val) {
      $row = explode("\t", $val);
      if ($row[0] != '<?php exit;?>') {
       continue;
      }
      if ($row[3] == $hash && ($row[1] > $time - $maxtime)) {
       return;
      }
     }
   }
  }

  error_log($message, 3, $file);
 }

 /**
  * 清除文本部分字符
  *
  * @param string $message
  */
 public static function clear($message) {
  return str_replace(array("\t", "\r", "\n"), " ", $message);
 }

 /**
  * sql语句字符清理
  *
  * @static
  * @access public
  * @param string $message
  * @param string $dbconfig
  */
 public static function sqlclear($message, $dbconfig) {
  $message = self::clear($message);
  if (!(defined('site_debug') && site_debug)) {
   $message = str_replace($dbconfig['database'], '***', $message);
   //$message = str_replace($dbconfig['prefix'], '***', $message);
   $message = str_replace(c('db_prefix'), '***', $message);
  }
  $message = htmlspecialchars($message);
  return $message;
 }

 /**
  * 显示错误
  *
  * @static
  * @access public
  * @param string $type 错误类型 db,system
  * @param string $errormsg
  * @param string $phpmsg
  */
 public static function showerror($type, $errormsg, $phpmsg = '') {
  global $_g;

  $errormsg = str_replace(site_path, '', $errormsg);
  ob_end_clean();
  $host = $_server['http_host'];
  $title = $type == 'db' ? 'database' : 'system';
  echo <<<eot
<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">
<html>
<head>
 <title>$host - $title error</title>
 <meta http-equiv="content-type" content="text/html; charset={$_g['config']['output']['charset']}" />
 <meta name="robots" content="noindex,nofollow,noarchive" />
 <style type="text/css">
 <!--
 body { background-color: white; color: black; font: 9pt/11pt verdana, arial, sans-serif;}
 #container {margin: 10px;}
 #message {width: 1024px; color: black;}
 .red {color: red;}
 a:link {font: 9pt/11pt verdana, arial, sans-serif; color: red;}
 a:visited {font: 9pt/11pt verdana, arial, sans-serif; color: #4e4e4e;}
 h1 {color: #ff0000; font: 18pt "verdana"; margin-bottom: 0.5em;}
 .bg1 {background-color: #ffffcc;}
 .bg2 {background-color: #eeeeee;}
 .table {background: #aaaaaa; font: 11pt menlo,consolas,"lucida console"}
 .info {
  background: none repeat scroll 0 0 #f3f3f3;
  border: 0px solid #aaaaaa;
  border-radius: 10px 10px 10px 10px;
  color: #000000;
  font-size: 11pt;
  line-height: 160%;
  margin-bottom: 1em;
  padding: 1em;
 }

 .help {
  background: #f3f3f3;
  border-radius: 10px 10px 10px 10px;
  font: 12px verdana, arial, sans-serif;
  text-align: center;
  line-height: 160%;
  padding: 1em;
 }

 .sql {
  background: none repeat scroll 0 0 #ffffcc;
  border: 1px solid #aaaaaa;
  color: #000000;
  font: arial, sans-serif;
  font-size: 9pt;
  line-height: 160%;
  margin-top: 1em;
  padding: 4px;
 }
 -->
 </style>
</head>
<body>
<div id="container">
<h1>$title error</h1>
<div class='info'>$errormsg</div>
eot;
  if (!empty($phpmsg)) {
   echo '<div class="info">';
   echo '<p><strong>php debug</strong></p>';
   echo '<table cellpadding="5" cellspacing="1" width="100%" class="table"><tbody>';
   if (is_array($phpmsg)) {
    echo '<tr class="bg2"><td>no.</td><td>file</td><td>line</td><td>code</td></tr>';
    foreach ($phpmsg as $k => $msg) {
     $k++;
     echo '<tr class="bg1">';
     echo '<td>' . $k . '</td>';
     echo '<td>' . $msg['file'] . '</td>';
     echo '<td>' . $msg['line'] . '</td>';
     echo '<td>' . $msg['function'] . '</td>';
     echo '</tr>';
    }
   } else {
    echo '<tr><td><ul>' . $phpmsg . '</ul></td></tr>';
   }
   echo '</tbody></table></div>';
  }
  echo <<<eot
</div>
</body>
</html>
eot;
  exit();
 }
}

/**
 * db异常类
 *
 * @author blog.snsgou.com
 */
class dbexception extends exception {

 protected $sql;
 protected $dbconfig; // 当前数据库配置信息

 public function __construct($message, $code = 0, $sql = '', $dbconfig = array()) {
  $this->sql = $sql;
  $this->dbconfig = $dbconfig;
  parent::__construct($message, $code);
 }

 public function getsql() {
  return $this->sql;
 }

 public function getdbconfig() {
  return $this->dbconfig;
 }
}