Combining Multiple foreach Result in json_encode - php

Question

I am trying to get the following json_encode output:
The Array:
echo json_encode(array(
array(
'id' => 111,
'title' => "Event1",
'start' => "2012-8-10",
'end' => "2012-8-15",
'url' => "http://yahoo.com/",
),
array(
'id' => 222,
'title' => "Event2",
'start' => "2012-8-20",
'end' => "2012-8-22",
'url' => "http://yahoo.com/"
)
));
OUTPUT:
[{"id":111,"title":"Event1","start":"2012-8-10","end":"2012-8-15","url":"http:\/\/yahoo.com\/"},{"id":222,"title":"Event2","start":"2012-08-20","end":"2012-08-22","url":"http:\/\/yahoo.com\/"}]
However, when I am using the following code
global $wpdb;
$row = $wpdb->get_results("SELECT $wpdb->posts.ID, $wpdb->posts.post_title FROM $wpdb->posts WHERE $wpdb->posts.post_type = 'calendar' AND $wpdb->posts.post_status = 'publish' ORDER BY $wpdb->posts.post_date ASC");
foreach ($row as $post) {
$postid = $post->ID;
$post_title = $post->post_title;
$startDate = get_post_meta($post->ID,'calendar_start-date',true);
$endDate = get_post_meta($post->ID,'calendar_end-date',true);
$link = get_post_meta($post->ID,'calendar_link',true);
$arr = array('id' => $postid, 'title' => $post_title, 'start' => $startDate, 'end' => $endDate, 'url' => $link);
echo json_encode($arr);
}
I get the output as
{"id":"320","title":"Test Event One","start":"2012-8-17","end":"2012-8-24","url":"http:\/\/www.yahoo.com"}{"id":"321","title":"Test Event Two","start":"2012-8-21","end":"2012-8-30","url":"http:\/\/www.google.com"}
I understand it is probably due to the json_encode being inside the foreach loop. However when I try it outside, it only shows the first result. How to combine these foreach values to achieve the output as mentioned above?

Answer 1

you could use this:
global $wpdb;
$posts = array();
$row = $wpdb->get_results("SELECT $wpdb->posts.ID, $wpdb->posts.post_title FROM $wpdb->posts WHERE $wpdb->posts.post_type = 'calendar' AND $wpdb->posts.post_status = 'publish' ORDER BY $wpdb->posts.post_date ASC");
foreach ($row as $post) {
$postid = $post->ID;
$post_title = $post->post_title;
$startDate = get_post_meta($post->ID,'calendar_start-date',true);
$endDate = get_post_meta($post->ID,'calendar_end-date',true);
$link = get_post_meta($post->ID,'calendar_link',true);
$arr = array('id' => $postid, 'title' => $post_title, 'start' => $startDate, 'end' => $endDate, 'url' => $link);
$posts[] = $arr;
}
echo json_encode($posts);
I think that should work