3v4l.org

run code in 300+ PHP versions simultaneously
<?php $arr = [ "https://i.imgur.com/vyGHgZN.jpg" => "dummy2", "https://i.imgur.com/UYK4Agz.png" => "dummy", "https://i.imgur.com/xEXdKYn.jpg" => "dummy", ]; $result = []; foreach ($arr as $key => $value) { $result[$value][] = $key; } print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [dummy2] => Array ( [0] => https://i.imgur.com/vyGHgZN.jpg ) [dummy] => Array ( [0] => https://i.imgur.com/UYK4Agz.png [1] => https://i.imgur.com/xEXdKYn.jpg ) )

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