<?php
$datos = "";
$array = array(1, 2, 3, 4); foreach ($array as $valor => $dato) {
$datos = $datos . $dato . ",";
}
$app = rtrim($datos, ","); echo $app;
PD9waHAKCiAgJGRhdG9zID0gIiI7CiAgJGFycmF5ID0gYXJyYXkoMSwgMiwgMywgNCk7CiAgZm9yZWFjaCAoJGFycmF5IGFzICR2YWxvciA9PiAkZGF0bykgewogICAgJGRhdG9zID0gJGRhdG9zIC4gJGRhdG8gLiAiLCI7CiAgfQoKICAkYXBwID0gcnRyaW0oJGRhdG9zLCAiLCIpOwogIGVjaG8gJGFwcDs=