Re: Extending Exception

[Richard Quadling <rquadling@xxxxxxxxx>]

On 21 July 2010 16:10, Christoph Boget <jcboget@xxxxxxxxxxx> wrote:
> Ok, so taking the sample code that is on the page
>
> http://us3.php.net/manual/en/language.exceptions.extending.php
>
> Literally, just cutting and pasting the code.  When I try to
>
> throw new Exception( 'My Message' );
>
> PHP spits out the following fatal error:
>
> Fatal error: Wrong parameters for Exception([string $exception [, long $code ]])
>
> and the line number it dies on is the line in the
> MyException::__construct() where it is calling the parent's
> constructor.  So what's going on?  Is the documentation wrong?  Is
> this a bug?  Am I doing something wrong?
>
> I'm using PHP 5.2.9.
>
> thnx,
> Christoph
>
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>

As of V5.3.0, exceptions can be nested [1].

The example code will generate the following errors.

V5.0.x : Fatal error: Argument 3 must not be null
V5.1.0 - V5.1.1 : Fatal error: Wrong parameter count for
exception([string $exception [, long $code ]])
V5.1.1 - V5.2.x : Fatal error: Wrong parameters for Exception([string
$exception [, long $code ]])

The nesting is controlled by the 3rd parameter to the constructor.
Removing this will allow the code to work on your version.

<?php
class MyException extends Exception
{
    // Redefine the exception so message isn't optional
    public function __construct($message, $code = 0) {
        // some code

        // make sure everything is assigned properly
        parent::__construct($message, $code);
    }

    // custom string representation of object
    public function __toString() {
        return __CLASS__ . ": [{$this->code}]: {$this->message}\n";
    }

    public function customFunction() {
        echo "A custom function for this type of exception\n";
    }
}

?>


Regards,

Richard Quadling.

[1] http://us3.php.net/manual/en/migration53.new-features.php

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