The difference between ?: and ?? among the new features of PHP7

This article is about introducing the two new features of ?: and ?? in PHP, and using code to explain them. Interested friends can learn about them.

?: and ?? are new features added by PHP. We can understand it through the following code

$z = $x ?? $y;
//等价于下面
$z = isset($x) ? $x : $y;

$z = $x ?: $y;
//等价于下面
$z = $x ? $x : $y;

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