Extending PHP's Exception Class

AppException.php

<?php
//AppException.php

class AppException extends Exception {
        
 public function __construct($msg="", $code = 0) {
  /*
    PHP's Exception class will handle all 
    of the necessary validation
  */
  parent::__construct($msg, $code);
 }
	
 public function __toString() {
   return "[{$this->code}]: 
            <span class='error'>
            {$this->message}
            </span>
            <br />" . 
            var_dump($this);
 }
	
 //renders view file
 private static function renderExceptionView($path, $vars) {
 //check if $path points to an existing file
   if(!file_exists($path)) {
     echo "Specified Template Does not Exist";
   } 
   else {
     /*
     takes an associative array and uses 
     the array's keys to create variables and 
     the array's values as their respective values
     */
     if(is_array($vars) && count($vars) > 0) {
       //extract array elements and prefix duplicates with AppException
       extract($vars, EXTR_PREFIX_SAME, "AppException_");
       //include the file
       include_once($path);
     }
  }
}
  //handle 404 example
  public function get404($view = NULL, array $viewVars = NULL) {
    //set status
    header("Status: 404 Not Found");
    //set content type
    header("Content-type: text/html");
    //call static function renderExceptionView to load your page
    self::renderExceptionView($view, $viewVars);
  }
}

Index.php

<?php
//How To Instantiate

$error = new AppException();
$error->get404("PATHTOVIEW/404_view.inc.php", array("title" => "Page Not Found"));

// OR

try {
  //something to try
} catch(AppException $e) {
  $e->get404("PATHTOVIEW/404_view.inc.php", array("title" => "Page Not Found"));
}
?>