max value within both an array and non-array are given

Question

I am creating a function that will lookup for the maximum value within an array. However, say I have this example,

function MaxArray($arr)
{
    return max($arr);
}
$arr = array(array(141,151,161), 2, 3, array(101, 202, array(303,404)));
print_r(MaxArray($arr));

This will return values Array ( [0] => 141 [1] => 151 [2] => 161 )

What I want for an output is to get 404 because it is the highest value in the array. Any insights? Thanks.

flatten the array first.

Keith Layne
– Keith Layne

2011-12-17 04:31:28 +00:00
Commented Dec 17, 2011 at 4:31 — Keith Layne
– Keith Layne, Commented Dec 17, 2011 at 4:31

Shad · Accepted Answer · 2011-12-17 04:33:07Z

2

As a modification of your function

function MaxInArray ($arr) {
    $m = NULL;
    foreach ($arr as $v) {
        if (is_array($v)) $v = MaxInArray($v);
        if (is_null($m) || $v > $m) $m = $v;
    }
    return $m;
}

Made it recursive.

answered Dec 17, 2011 at 4:33

Shad

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Comments

hakre · Accepted Answer · 2012-08-27 08:29:42Z

0

PHP has many features built-in to flatten or recursively walk the array, e.g. array_walk_recursive^Docs. For example combine with an anonymous function^Docs this can be solved with some little code:

array_walk_recursive($arr, function($v) use(&$max) {$max = max($v, $max);});

var_dump($max); # int(404)

Demo

answered Aug 27, 2012 at 8:29

hakre

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