Find Highest Value in Multidimensional Array

Find highest value in multidimensional array

Since PHP 5.5 you can use array_column to get an array of values for specific key, and max it.

max(array_column($array, 'Total'))

How to find the highest value in a multidimensional array?

You can try using recursive function

    <?php

    $ar3=array(123, array(12, 665, array(77, 255, 98, 56), 8), 1155, 676); 

    function highestValue($ar3) {
       foreach($ar3 as $key => $value) {
           if (is_array($value)) {
               $ar3[$key] = highestValue($value);
           }
       }

         return max($ar3);
    }

    echo highestValue($ar3); //1155

Finding the Max value in a two dimensional Array

Max of max numbers (map(max, numbers) yields 1, 2, 2, 3, 4):

>>> numbers = [0, 0, 1, 0, 0, 1], [0, 1, 0, 2, 0, 0], [0, 0, 2, 0, 0, 1], [0, 1, 0, 3, 0, 0], [0, 0, 0, 0, 4, 0]

>>> map(max, numbers)
<map object at 0x0000018E8FA237F0>
>>> list(map(max, numbers))  # max numbers from each sublist
[1, 2, 2, 3, 4]

>>> max(map(max, numbers))  # max of those max-numbers
4

find max() of specific multidimensional array value in php

Think array_reduce if you want to compute some single value iteratively over an array:

$max = array_reduce($array, function($a, $b) { 
  return $a > $b['time'] ? $a : $b['time']; 
} );

Or you could make use of a utility function like:

function array_col(array $a, $x)
{
  return array_map(function($a) use ($x) { return $a[$x]; }, $a);
}

which would be used like:

$max = max(array_col($array, 'time'));

It's more general purpose and could be used for other similar things.

Get the highest value from multidimensional array based on mentioned array in php

Doing this in PHP is simple enough, you could just loop through the categories and check first that the category_id is in the array of category id's you are interested in, then compare the final_price against the current maximum...

$max = ["final_price" => PHP_INT_MIN];
foreach ( $categories as $category )    {
    if ( in_array($category["category_id"], $catids)
            && $category["final_price"] > $max["final_price"] ) {
        $max = $category;
    }
}
print_r($max);

which with the test data gives...

Array
(
    [category_id] => 240
    [final_price] => 3500
)

Get highest value from multidimensional array

Maybe something like this:

$arrOrg = [2, 3, [5, 7, 1], 100, [6, 9, [14, 95]], 78];
$json   = json_encode($arrOrg);
$json   = str_replace(array('[', ']'), "", $json);
$arr    = explode(",", $json);

echo $maximum = max($arr);

EDIT after Vahe Galstyan comment

$arrOrg = array(
    2, 
    3,
    array(5, 7, 1), 
    100,
    array(
        6, 
        9, 
        array(14, 95)
    ), 
    78
);

$json = json_encode($arrOrg);
$json = str_replace(array('[', ']'), "", $json);
$arr  = explode(",", $json);

echo $maximum = max($arr);

Retrieve key from max value in multidimensional associativ array

Working off of your response, I would suggest these small tweaks:

<?php
$resultCache[129] = [
    'total'                => 1000,
    'free_from'            => "2000",
    'addinupshippingcosts' => "0",
    'articles'             => [
        ['shipping_costs_total' => 11],
        ['shipping_costs_total' => 23],
        ['shipping_costs_total' => 25], //<= i want the key of this array entry
        ['shipping_costs_total' => 12],
    ]
];

foreach($resultCache as $r) {
    $col = array_column($r['articles'], 'shipping_costs_total');
    $highest = array_keys($col, max($col));
    $highest = $highest[0] ?: false;
    echo $highest;
}

Hope this helps,

Find highest value in multidimensional array and keep highest

You already done most of the job by arranging the test elements per user. What remains is to filter this list.

Consider you have this list of "test-elements": (as John Doe in your example)

$a = array("quiz" => "Foo Test 1", "score" => "90");
$b = array("quiz" => "Foo Test 1", "score" => "100");
$c = array("quiz" => "Foo Test 2", "score" => "75");
$d = array("quiz" => "Foo Test 2", "score" => "75");
$quizes = array($a, $b, $c, $d);

You can narrow it by:

$res = array();
foreach($quizes as $quize) {
        if (!isset($res[$quize["quiz"]]) || ($res[$quize["quiz"]]["score"] < $quize["score"])) // is first test or this test higher then the previous  
                $res[$quize["quiz"]] = $quize;
}
$res = array_values($res); // because all you want are the quiz elements

Now $res will output:

Array
(
    [0] => Array
        (
            [quiz] => Foo Test 1
            [score] => 100
        )
    [1] => Array
        (
            [quiz] => Foo Test 2
            [score] => 75
        )
)

Hope that helps!

Edited

Define the following function:

function filterQuizesByScore($quizes) {
        $res = array();
        foreach($quizes as $quize) {
        if (!isset($res[$quize["quiz"]]) || ($res[$quize["quiz"]]["score"] < $quize["score"]))
                $res[$quize["quiz"]] = $quize;
        }
        return array_values($res);
}

Use it in student_scores function. After foreach ( $quizzes as $x ) scope add new loop as:

foreach($out as &$elem) {
    $elem["quizes"] = filterQuizesByScore($elem["quizes"]);
}

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