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$arr = ["1:A", "2:B", "3:C", "4:D", "5:E"];
$arr = json_decode("{".implode(',', array_map(function($item){
return preg_replace('/(.+?):(.+?)/', '"$2":"$1"', $item);
}, $arr))."}", true);
print_r($arr);
/** output
Array
(
[A] => 1
[B] => 2
[C] => 3
[D] => 4
[E] => 5
)
**/