3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo($a) { $page = isset($a['page']) ? $a['page'] : 1; echo 'P: ', $page, "\n"; $page = $a['page'] ?? 1; echo 'P: ', $page, "\n"; $page = array_key_exists('page', $a) ? $a['page'] : 1; echo 'P: ', $page, "\n"; } $a = array('page' => 3); foo($a); $a = array(); foo($a); $a = array('page' => Null); foo($a); $a = array('page' => 0); foo($a); ?>
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
P: 3 P: 3 P: 3 P: 1 P: 1 P: 1 P: 1 P: 1 P: P: 0 P: 0 P: 0
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Parse error: syntax error, unexpected '?' in /in/Akqad on line 8
Process exited with code 255.

preferences:
275.48 ms | 401 KiB | 326 Q