What does "?:" mean in PHP? [duplicate]

Frage

While browsing the code of an open source PHP library I spotted this line:

$path = $path ?: $this->guessPackagePath();

This is not the ternary operator like it usually apprears. Would anyone explain what is going on in it?

Lösung

It's a shortcut for

$path = $path ? $path : $this->guessPackagePath();

which comes from PHP 5.3

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