Tantangan PHP Group: Validasi Input Array Mencari data Pairs

validate_pairs.php

<?php
function my_var_dump($prefix, $data) {
    echo $prefix . ": ";
    array_walk($data, function($val,$key) {
        echo json_encode($val) . ' ';
    });
    echo "\n";
}

function validate_pairs($data, $sum) {
    // message: initial data
    my_var_dump("data",$data);

    // group data into clusters
    $proses = [];
    array_walk($data, function($val,$key) use(&$proses) {
        $proses[$val][] = $val;
    });

    // proses cluster, filter non pair
    $result = array_filter($proses, function($el) {
        return count($el)==2;
    });
    // calculate total
    $total = 0;
    array_walk($result, function($val,$key) use(&$total) {
        $total += $key+$key;
    });

    // message: process result
    my_var_dump("pairs",$result);
    my_var_dump("total",[$total]);

    return $sum==$total and count($result)>0;
}

// test case 1
$data = [8,9,1,2,3,4,1,2,4,5,6,7,8,3,4];
echo validate_pairs($data,28) ? "true" : "false";
echo "\n\n";

// test case 2
$data = [0,1,2,3,4,5,0];
echo validate_pairs($data,0) ? "true" : "false";
echo "\n\n";

/***
 * Output
 ********************
data: 8 9 1 2 3 4 1 2 4 5 6 7 8 3 4 
pairs: [8,8] [1,1] [2,2] [3,3] 
total: 28 
true

data: 0 1 2 3 4 5 0 
pairs: [0,0] 
total: 0 
true
 */