CODEWITHSUNDEEP
phparrayssortingkeymax
Grzegorz Zając
Grzegorz Zając

Reputation: 117

Get keys of 5 bigests value from array

I have one problem. I must get 5 images which rates are the biggest. I have table which key = image_id and value = average rating.

Below is print_r of this array

Array ( ['5'] => 5.00 ['4'] => 3.05 ['12'] => 3.00 ['11'] => 4.00 ['21'] => 2.11 ['53'] => 4.44 )

For example

['5'] => 5.00

means that img which id = '5' have rating 5.00

Expected output 2 Arrays ($id and $rating)

Array ( [0] => '5' [1] => '53' [2] => '11' [3] => '4' [4] => '12' )
Array ( [0] => '5.00' [1] => '4.44' [2] => '4.00' [3] => '3.05' [4] => '3.00' )

Can you help me in this?

Upvotes: 1

Views: 100

Answers (2)

user1846065
user1846065

Reputation:

Use arsort(); and array_slice();

You can also avoid making 2 separate arrays with functions like array_keys(); and array_values();

// Original array
$array = array(
    5 => 5.00,
    4 => 3.05,
    12 => 3.00,
    11 => 4.00,
    21 => 2.11,
    53 => 4.44
);

// Sort array & maintain keys
arsort($array);

// Now get the first 5 elements, keeping the keys
$array = array_slice($array, 0, 5, true);

// IDs
print_r(array_keys($array));

// Ratings
print_r(array_values($array));

Upvotes: 2

Jesko R.
Jesko R.

Reputation: 827

Have you tried to use arsort or uasort?

Upvotes: 0

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