<?php
$next = 1;

for ($i = 1; $i <= 15; $i++){
	switch($next){
		case 1:
			echo "Es " . $i . ", imprime 1\r\n";
			$next = 4;
			break;
		case 4:
			echo "Es " . $i . ", imprime 4\r\n";
			$next = 0;
			break;
		case 0:
			echo "Es " . $i . ", imprime 0\r\n";
			$next = 1;
			break;
	}
}