3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array('a' => 1, 'b' => 2, 'c' => 3); $b = array('a' => 1, 'b' => 2); $c = $b['c'] ?: $a['c']; var_dump($c);

preferences:
40.65 ms | 402 KiB | 5 Q