3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a1 = array('foo' => 'foo', 'bar' => 'bar'); $a2 = array('zuu' => 'zuu', 'bar' => 'bar2'); var_dump($a1+$a2, array_merge($a1,$a2), array_merge($a1+$a2));
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, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 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(3) { ["foo"]=> string(3) "foo" ["bar"]=> string(3) "bar" ["zuu"]=> string(3) "zuu" } array(3) { ["foo"]=> string(3) "foo" ["bar"]=> string(4) "bar2" ["zuu"]=> string(3) "zuu" } array(3) { ["foo"]=> string(3) "foo" ["bar"]=> string(3) "bar" ["zuu"]=> string(3) "zuu" }

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