Correct usage of the isset, recomended by IDE?

Question

I am using PHPStorm and the inspection is recommending that I switch this line of code:

$orderings['custom'][$child->id] = isset($custom_values[$child->id]) ? $custom_values[$child->id] : $next_order++;

to this:

$orderings['custom'][$child->id] = $custom_values[$child->id] ?? $next_order++;

But I can't find information in the PHP documentation about this change. Are changes like this non breaking and what is the ?? doing?

It's PHP's [null coalescing operator](https://stackoverflow.com/questions/53610622/what-does-double-question-mark-operator-mean-in-php) — 0stone0, May 13 '20 at 13:35
See the [documentation](https://www.php.net/manual/en/migration70.new-features.php#migration70.new-features.null-coalesce-op). Do note that `??` will produce a syntax error on any setup with ` — DarkBee, May 13 '20 at 13:35

score 0 · Accepted Answer · answered May 13 '20 at 13:42

In this statement...

$orderings['custom'][$child->id] = $custom_values[$child->id] ?? $next_order++;

?? it work as

if $custom_values[$child->id] value is not null then it use $custom_values[$child->id] value
if $custom_values[$child->id] value is null then it use $next_order value

1 Answers1