<?php

function f($x){$r=$x%10;return array("товар","товаров","товара")[$x>10&&$x<20?1:($r!=1)+($r>1&&$r<5)];}
$a = array(0,1,6,15);
array_walk($a, function($x){echo f($x)."\n";});
echo "\n";

function g($x){return $x.' '.f($x);}
$a = range(0,30);
array_walk($a, function($x){echo g($x)."\n";});