PHP syntax ?? meaning,can somebody explain?

Question

I've seen this code and I don`'t know what does it mean

$page = $_GET['page'] ?? 'home';

Can somebody tell me its meaning?

It's the [Null Coalescence Operator](http://php.net/manual/en/language.operators.comparison.php) — Mark Baker, Feb 15 '18 at 08:04

Krzysztof Atłasik · Accepted Answer · 2019-02-09T09:41:26.657

3

It's null coalesce operator. It will return $_GET['page'] unless it's null. In case it's null it would return default value 'home'.

It has same meaning as:

!is_null($_GET['page']) ? $_GET['page'] : 'home'

edited Feb 09 '19 at 09:41

answered Feb 15 '18 at 08:06

2

Not only `is_null` but `isset` too. So if you do `echo $undefinedVar ?? 'test'` the result would be `test` – Mihai Matei Feb 15 '18 at 08:32

1 Answers1