Variable selection during assignment

Question

There are such variables

$z1=''; $z2='hell';

How to assign z3 value by analogy with the following code?

 $z1=''; $z2='hell'; if(!empty($z1)) $z3=$z1; else $z3=$z2;

Then this is a duplicate of one of the questions: ru.stackoverflow.com/questions/80718 , ru.stackoverflow.com/questions/103398 , ru.stackoverflow.com/questions/351700 and others
@ BOPOH, thank you for what you need. I didn’t know how to formulate a question for Google)

Timofei Bondarev 6,940 3 gold marks 32 silver marks 51 bronze marks · Answer 1 · 2015-08-24T16:04:41

 $z3 = (empty($z1)) ? $z2 : $z1;

Timofei Bondarev

6,940 3 gold marks 32 silver marks 51 bronze marks

Syndrom

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