如何从php数组中提取值

Question

I'm trying to return the LARGEST numerical value associated with the 'reduced' array below. Easy enough if there is one value but many have two- as below. I'm using

$reduced_array = $data['rates'][1]['rates'][0];

but this only works in returning the first value. I need to return just the highest value however- so below it would be 8. would something like

 if(count($data['rates'][1]['rates']) > 2) {
        ***return largest value here***

work? I'm just not sure how to perform the asterisked task- maybe a for loop? here is the array.

Array
(
[rates] => Array
    (
        [0] => Array
            (
                [name] => Super Reduced
                [rates] => Array
                    (
                    )

            )

        [1] => Array
            (
                [name] => Reduced
                [rates] => Array
                    (
                        [0] => 5
                        [1] => 8
                    )

            )

        [2] => Array
            (
                [name] => Standard
                [rates] => Array
                    (
                        [0] => 23
                    )

            )

        [3] => Array
            (
                [name] => Increased
                [rates] => Array
                    (
                    )

            )

        [4] => Array
            (
                [name] => Parking
                [rates] => Array
                    (
                    )

            )

    )

[disclaimer] => Rates data is based on information published by the European Commission, updated 1st January 2017.
)

Thanks for any help

Answer 1

You can use max() for that.

$array = array(
    "rates" => array(
        array(
            "name" => "Super Reduced",
            "rates" => array()
        ),
        array(
            "name" => "Reduced",
            "rates" => array(
                5,
                8
            )
        )
    )
);

echo max($array["rates"][1]["rates"]); // 8