No $foo ?: 'default' , it's only equivalent to (isset($foo) && $foo) ?
$foo : 'default' if $foo exists.
Also PHP has added ?? as null-coalescing operator that works with
undefined variables/attributes/keys, my proposal is an improvement over
this one.
I don't want to endorse usage of undefined variables, can be used in a
large set of situations, like object attributes, array keys, etc...
Anyway thanks for your feedback.
Lito.
On 17/01/18 19:17, Marco Pivetta wrote:
This:
echo (isset($foo) && $foo) ? $foo : 'default';
Is equivalent to:
echo $foo ?: 'default';
Please don't endorse usage of undefined variables.
On 17 Jan 2018 19:00, "Lito" <i...@eordes.com
<mailto:i...@eordes.com>> wrote:
Related with Request #75833 https://bugs.php.net/bug.php?id=75833
<https://bugs.php.net/bug.php?id=75833>
>From PHP 7 null-coalescing operator is a great option to avoid a
previous exists check with isset.
But I think that this comaparison can be improved adding a ternary
operator like ??: and check also empty values.
Example:
--------------------------------------
<?php
$foo = '';
// Current response with ternary operator
echo $foo ?: 'default'; // 'defaut'
// Current response with null-coalescing operator
echo $foo ?? 'default'; // ''
// Possible response with ternary null-coalescing operator
echo $foo ??: 'default'; // 'defaut'
// Same response with current PHP available code
echo (isset($foo) && $foo) ? $foo : 'default'; // 'default'
/** ------------------------------- **/
$foo = false;
// Current response with ternary operator
echo $foo ?: 'default'; // 'defaut'
// Current response with null-coalescing operator
echo $foo ?? 'default'; // false
// Possible response with ternary null-coalescing operator
echo $foo ??: 'default'; // 'defaut'
// Same response with current PHP available code
echo (isset($foo) && $foo) ? $foo : 'default'; // 'default'
/** ------------------------------- **/
$foo = null;
// Current response with ternary operator
echo $foo ?: 'default'; // 'defaut'
// Current response with null-coalescing operator
echo $foo ?? 'default'; // 'defaut'
// Possible response with ternary null-coalescing operator
echo $foo ??: 'default'; // 'defaut'
// Same response with current PHP available code
echo (isset($foo) && $foo) ? $foo : 'default'; // 'default'
/** ------------------------------- **/
unset($foo);
// Current response with ternary operator
echo $foo ?: 'default'; // PHP Notice: Undefined variable: foo
// Current response with null-coalescing operator
echo $foo ?? 'default'; // 'defaut'
// Possible response with ternary null-coalescing operator
echo $foo ??: 'default'; // 'defaut'
// Same response with current PHP available code
echo (isset($foo) && $foo) ? $foo : 'default'; // 'default'
--------------------------------------
What about?
Thanks!
Lito.
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