array_flip to print duplicate values in comma separated format

Question

I\'m trying to use array_flip to print duplicate values in a comma separated format

$a=array(\"a\"=>\"red\",\"b\"=>\"green\",\"c\"=>\"b         


        

Answer 1

You need to make your function along with array_flip like as

$array = array("a"=>"red","b"=>"green","c"=>"blue","d"=>"blue");

$res = array_flip($array);

foreach ($res as $k => $v)
    $res[$k] = implode(", ", array_keys($array, $k));
print_r($res);

Output :

Array
(
    [red] => a
    [green] => b
    [blue] => c, d
)

Demo