simple json scroller

scroll.php

<?php

$betweenletters=0;
$firstline=2000000;
$betweentalks=10000000;

function spline($line) {
	global $betweenletters;
	for ($i=0;$i<strlen($line);$i++) {
		echo $line[$i];
		usleep($betweenletters);
	}
	echo "\n";
}
function scrolltext($line) {
	$len=79;
	$pad=str_repeat(" ",$len);
	$out=$pad.$line.$pad;
	for ($i=0;$i<mb_strlen($line)+$len;$i++) {
		echo chr(27) . "[0G".mb_substr($out, $i, $len);
		usleep(100000);
	}
}

$json=file_get_contents("http://varnaconf.com/schedules/2015.json");
$decoded = json_decode ($json);

$t=1;
$s=2;
$track=$decoded->$t;

for($tn=2;$tn<8;$tn++) {
	$talk=$track[$tn];
	$dt=date_create($talk->startTime);
	$pdt=$dt->format("H:i");
	system("clear");
	spline("		VarnaConf 2015\n");
	spline("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
	if (empty($talk->speakers)) {
		$tname="Всички";
		$tdesc="Мяу. Някой да нахрани терминала.";
	} else {
		$tname=$talk->speakers[0]->name;
		$tdesc=$talk->speakers[0]->description;
	}
	spline($pdt." ".$tname." - ".$talk->title."\n");
	usleep($firstline);
	spline($tdesc);
	spline("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");
	echo "\n\n";
	scrolltext("Пийте повече вода, за да не се дехидрирате");
	scrolltext("Друг generic текст за посетителите");
	usleep($betweentalks);
}