php variable = variable1 || variable2

Question

Is this possible?

php $variable = $variable1 || $variable2?

if $variable1 is empty use $variable2

Is there existing that is something like that?

Answer 1

PHP 5.3+:

$variable = $variable1 ?: $variable2;

PHP 5.2-:

$variable = $variable1 ? $variable1 : $variable2;