>> They should check that a certain variable is defined for example, and if
>> not, do not display anything... even if the hosted website is configured
>> to display errors, and you cannot change this.
>
> Exactly my point: you may not have the choice of your PHP configuration.

I said I agreed with you. But you can use secure software (or modify the
unsecure ones you have), so that they don't enable a full path
disclosure, even if you don't have the choice of your PHP configuration!
Can't you? ;)

> Note that checking a variable is set may note be the best solution as
> attacker can provide it as well ;)

I said "for example", as I know this is how MediaWiki does:

if ( ! defined( 'MEDIAWIKI' ) )
die( 1 );

How would you do it?

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