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@ 2019-07-14T16:59:15Z

<?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
Performance
VLD
References
Branches

var_dump: documentation ( source)

preferences:dark modelive previewkey bindings

14.68 ms | 404 KiB | 5 Q