Description:
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From manual page: http://php.net/manual/en/language.operators.comparison.php
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Ternary Operator documentation includes following sentence.

'Expression expr1 ?: expr3 returns expr1 if expr1 evaluates to TRUE, and expr3 otherwise.'

That should be like below.

'Expression expr1 ?: expr3 returns expr2 if expr1 evaluates to TRUE, and expr3 otherwise.'