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What is the difference between null coalesce operator and elvis?

$a = null; echo $a ?: 'default1'; echo $a ?? 'default2';

It looks to me as they are doing the same job. However there must be difference. :)

Can someone point it out for me?

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  • Hey, the exact same thing popped into my mind Commented Feb 12, 2018 at 8:02
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