Php associative array sort and get key with highest length [duplicate]

Question

Hey i have an associative array which has keys as String and values as Int. So from that associative array i need to get the key which has the highest value and if multiple keys have the same value then i need the key with the highest length.

So whats the most efficient way of doing this?

example

array = (
    'abc'     => 10,
    'def'     => 8,
    'fff'     => 3,
    'abcr'    => 10,
    'adsfefs' => 10
)

So for this i should get output as adsfefs

Answer 1

You can use array_keys and pass a second parameter to filter the returned keys to only include the max ones. You can then find the longest key by using array_reduce and a function that checks the lengths of the strings and throws out the shortest one, like so:

$array = array(
    'abc'     => 10,
    'def'     => 8,
    'fff'     => 3,
    'abcr'    => 10,
    'adsfefs' => 10
);

$keys = array_keys($array, max($array));
$longestKey = array_reduce($keys, function ($a, $b) { return strlen($a) > strlen($b) ? $a : $b; });

var_dump($longestKey);

Be aware that if there are two or more strings that are the same length, it will return the last one.