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Date: Mon, 6 Jul 2009 14:21:27 +1000
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Subject: RE: [PHP-DEV] autoloading and undefined class constants
From: ben@vuetec.com ("Ben Bidner")

> per the manual, exceptions thrown in an autoload method are swallowed,
> and an E_ERROR is triggered by php.
>
> http://us2.php.net/manual/en/language.oop5.autoload.php

I have read that note before, and wondered exactly what it was referring to=
 since you can throw exceptions within an autoloader and catch them (or hav=
e your exception handler do whatever it needs to do with them).

<?php

   function autoloader($className)
   {
      echo "autoloading" . PHP_EOL;
      throw new Exception("Fail");
   }

   spl_autoload_register("autoloader");

   try
   {
      // Exception
      $obj =3D new NonExistentClass;
   }
   catch(Exception $e)
   {
      echo "caught" . PHP_EOL;
   }

   try
   {
      // Exception
      $const =3D constant("NonExistentClass::NON_EXISTENT_CONSTANT");
   }
   catch(Exception $e)
   {
      echo "caught" . PHP_EOL;
   }

   try
   {
      // Fatal error
      $const =3D NonExistentClass::NON_EXISTENT_CONSTANT;
   }
   catch(Exception $e)
   {
      echo "never happens" . PHP_EOL;
   }
?>

Will output:

autoloading
caught
autoloading
caught
autoloading
PHP Fatal error: Undefined class constant


I would expect accessing a constant directly to behave as constant() does a=
t the moment .... and I would expect constant() to behave as the manual say=
s it does (and return NULL for non existent class constants instead of thro=
wing E_ERRORs).


Ben Bidner

+61.7.3161.2000 (office) | +61.7.3009.0651 (fax) | +61.4.3201.5362 (mobile)=

http://www.vuetec.com/