添加Error异常的ErrorContext参数，并打印ErrorContext到异常页面

library/think/exception/ErrorException.php

@@ -33,14 +33,17 @@ class ErrorException extends Exception
      * @param string  $message  错误详细信息
      * @param string  $file     出错文件路径
      * @param integer $line     出错行号
+     * @param array   $context  错误上下文，会包含错误触发处作用域内所有变量的数组
      */
-    public function __construct($severity, $message, $file, $line)
+    public function __construct($severity, $message, $file, $line, $context)
     {
         $this->severity = $severity;
         $this->message  = $message;
         $this->file     = $file;
         $this->line     = $line;
         $this->code     = 0;
+
+        empty($context) || $this->setData('Error Context', $context);
     }
 
     /**