<?php
class Arr
{
public static function str_to_arr($str)
{
$pieces = explode(',', $str);
foreach ($pieces as $p) {
}
}
public static function arr_to_str($arr)
{
$str = '';
if (is_array($arr)) {
foreach ($arr as $a) {
$str .= $a . ',';
}
$str = rtrim($str, ',');
}
return $str;
}
}