group an array based on their key

Can someone give me an idea how to group these array of fruits byt color?
example:
 associative array ["Mango" => "Green", "Strawberry" => "Red", "Lemon" => "Green"] should return ["Green" => ["Mango", "Lemon"], "Red" => ["Strawberry"]].
Ivan EsguerraAsked:
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Chris StanyonCommented:
Sure. Take a look at this:

$fruits = array(
    "Mango" => "Green",
    "Strawberry" => "Red",
    "Lemon" => "Green"
);

$grouped = array();

foreach ($fruits as $fruit => $color) {
    $grouped[$color][] = $fruit;
}

var_dump($grouped);

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