3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = array('0' => '0A', '1' => '1A'); $b = array('0' => '0B', '4' => '4B', '2' => '2B'); $c = array('0' => '0C', '3' => '3C', '2' => '2C'); $options = $a + $b + $c; print_r($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, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [0] => 0A [1] => 1A [4] => 4B [2] => 2B [3] => 3C )
preferences:
287.19 ms | 406 KiB | 456 Q