有两个参数的PHP异常

Question

I'm trying to find right solution to catch messages but not sure if this is possible or no.

I have a simple PHP structure with try and catch :

if (!$this->issetAndNotEmpty($id))
                    {
                        throw new Exception('My error message');
                    }

...
  catch (Exception $exc)
  {
        echo'<div class="error">'.  $exc->getMessage().'</div>';
  }
...

It works as supposed. But we have a requirement to return error noise(beep) on some errors (but not on all of them). Best way to do this is add new function into catch section. In this way it beeps every time. Is it possible to add second parameter into throw new Exception('My error message', true(or something like that)); and then run this function under if statement? Another way is to add variable inside class and set to true and check it inside catch before error message.

Is it possible to do that in first way?

Answer 1

You should create a specific Exception class that extends PHP's generic Exception that can take extra parameters, and will allow you to catch it specifically and handle as needed, allowing other exceptions to fall through to the default catch.

<?php

/**
 * Class BeepException
 * Exception that beeps
 */
class BeepException extends Exception
{
    // Member variable to hold our beep flag
    protected $beep;

    /**
     * BeepException constructor.
     * @param $message
     * @param bool $beep
     * @param int $code
     */
    public function __construct($message, $beep=false, $code = 0)
    {
        $this->beep = $beep;

        parent::__construct($message, $code);
    }

    /**
     * Return the value of our beep variable
     * @return bool
     */
    public function getBeep()
    {
        return $this->beep;
    }
}

try
{
    throw new BeepException('This should beep...', true);
}
catch(BeepException $e)
{
    echo $e->getMessage().PHP_EOL;

    if($e->getBeep())
    {
        echo 'BEEEEEEP!'.PHP_EOL;
    }
}
catch(Exception $e)
{
    echo $e->getMessage().PHP_EOL;
}