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Date: Thu, 19 Jul 2012 00:39:41 +0300
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Subject: Re: [PHP-DEV] Implicit isset in ternary operator
From: sv_forums@fmethod.com ("Stan Vass")

> It changes the semantics. If the variable is set to a falsey value and ?:
> uses an implicit isset, the value of the expression will be the falsey
> value.
>
>    $config['width'] = ''
>    $width = $config['width'] ?: 300
>    # $width == ''
>
> If !empty were used instead of isset, you could preserve semantics ($a ?:
> dflt = !empty($a) ? $a : dflt).
>

Since this has been discussed before, here's a previous solution with zero 
of those problems:

// A new operator.
$width = $config['width'] ?? 300;

// Actual behavior of the operator in pseudo code:
$width = isset($config['width']) ? $config['width'] : 300;

Why wasn't it implemented? No reason, it just wasn't. But people keep asking 
about it, so it's only a matter of time.

Stan