gistfile1.php

<?php
$begin = new DateTime('now');
$beginformat = $begin->format("Y-m-d");
$beginfinal = strtotime($beginformat);
$end = $begin->modify("+90 day");
$endformat = $end->format("Y-m-d");
$endfinal = strtotime($endformat);

$dates = array();

for ($i=$beginfinal; $i<=$endfinal; $i+=86400) {
	$dates[] = array("date" => date("Y-m-d", $i));
}

$dates = json_encode($dates);

print_r($dates);
?>