A helper to play with arrays

Array_helper.php

<?php
/*EXAMPLE
$array = array(
    0 => array (
        0 => 35,
        1 => 30,
        2 => 39
    ),
    1 => array (
        0 => 20,
        1 => 12,
        2 => 5
    ),
);

$user = array(19,13,3);*/
//END EXAMPLE
//Calculates which dimension of an array is closer of user's input
function array_proximity($referencial, $input){
    $totalRef = count($referencial);
    if (is_array($referencial)){
        for ($i = 0; $i < $totalRef; $i++) {
            if (is_array($referencial[$i])){
                $totalSubRef = count($referencial[$i]);
                $proximity = array();
                for ($j = 0; $j < $totalSubRef; $j++) {
                    $proximity[$i] += abs($referencial[$i][$j] - $input[$j]);
                }
                if ($i > 0){
                    if ($maxProximity['distance'] > $proximity[$i]) {
                        $maxProximity['distance'] = $proximity[$i];
                        $maxProximity['index'] = $i;
                    }
                } else {
                    $maxProximity['distance'] = $proximity[$i];
                    $maxProximity['index'] = $i;
                }
            }
        }
        return $maxProximity;
    } else {
        exit('Unexpected referencial. Must be an array.');
    }
}
//EXAMPLE
//$found = find($array, $user);
//print_r($found);
//END EXAMPLE
//RESULTS Array ( [distance] => 4 [index] => 1 )