3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array('0' => '0A', '1' => '1A', '2' => '2A'); $b = array('0' => '0B', '4' => '4B', '2' => '2B'); $c = array('0' => '0C', '3' => '3C', '2' => '2C'); $options = $c + $b; print_r($options);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [0] => 0C [3] => 3C [2] => 2C [4] => 4B )
preferences:
218.88 ms | 406 KiB | 311 Q