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run code in 300+ PHP versions simultaneously
<?php $arr = array( "https://i.imgur.com/vyGHgZN.jpg" => "dummy2", "https://i.imgur.com/UYK4Agz.png" => "dummy", "https://i.imgur.com/xEXdKYn.jpg" => "dummy" ); foreach($arr as $key => $val){ $res[$val][] = $key; } var_dump($res);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { ["dummy2"]=> array(1) { [0]=> string(31) "https://i.imgur.com/vyGHgZN.jpg" } ["dummy"]=> array(2) { [0]=> string(31) "https://i.imgur.com/UYK4Agz.png" [1]=> string(31) "https://i.imgur.com/xEXdKYn.jpg" } }

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