Online PHP editor | refs for 5mEPL

@ 2019-07-14T16:58:53Z

<?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);