3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a['a']['b']['c'] = ($a['a']['b']['c'] ?? 0) + 1; echo json_encode($a), PHP_EOL; $a['a']['b']['c'] = ($a['a']['b']['c'] ?? 0) + 1; echo json_encode($a), PHP_EOL;
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
{"a":{"b":{"c":1}}} {"a":{"b":{"c":2}}}
preferences:
88.87 ms | 1104 KiB | 4 Q