Question

I have these arras

[0] => Array
        (
            [TEAM] => Array
                (
                    [id] => 5
                    [name] => localhost

                )

            [Registraion] => Array
                (

                     [Registered] => 2011-09-20 09:20:51
                )

        )

[1] => Array
        (
            [TEAM] => Array
                (
                    [id] => 6
                    [name] => localhost

                )

            [Registraion] => Array
                (

                     [Registered] => 2011-09-20 09:30:51
                )


        )

[2] => Array
        (
            [TEAM] => Array
                (
                    [id] => 7
                    [name] => localhost

                )

            [Registraion] => Array
                (

                     [Registered] => 2011-09-20 09:40:51
                )


        )

I want to get this

[0] => Array
            (
                [TEAM] => Array
                    (
                        [id] => 5
                        [name] => localhost

                    )

                [Registraion] => Array
                    (

                         [Registered] => 2011-09-20 09:20:51
                    )

            )

as that person is the oldest to register.

How can I get the oldest registration value?

thanks

Answer 1

$oldestkey = null;

foreach (array_keys($array) as $key) {
    if (isnull($oldestkey) || ($array[$key]['Registraion']['Registered'] < $array[$oldestkey]['Registraion']['Registered']) {
         $oldestkey = $key;
    }
}

Note that your key Registraion is mis-spelled, I’m guessing it should be Registration? Also note that this code will not handle the case where there’s multiple keys with the same registration time. It’ll pick out the FIRST oldest time and return the key for that record. Any duplicate times will be ignored.