From array to JSON - php

Question

I am making parser of articles and I need to put all parsed data in josn. I tried to put them to array and then transform it in JSON, but I have some troubles. I get JSON like this:
[{"title":"title1"}][{"title":"title2"}][{"title":"title3"}]
But I want like this:
[{"title":"title1"},{"title":"title2"},{"title":"title3"}]
How I can do this?
<?
foreach ($content_prev as $el) {
$pq = pq($el);
$date = $pq->find('time')->html();
$title = $pq->find('h3 a')->html();
$link = $pq->find('h3 a')->attr('href');
$data_link = file_get_contents($link);
$document_с = phpQuery::newDocument($data_link);
$content = $document_с->find('.td-post-content');
$arr = array (
array(
"title" => $title
),
);
echo json_encode($arr, JSON_UNESCAPED_UNICODE);
}

Answer 1

Try to remove one array in $arr
Use below one.
<?
foreach ($content_prev as $el) {
$pq = pq($el);
$date = $pq->find('time')->html();
$title = $pq->find('h3 a')->html();
$link = $pq->find('h3 a')->attr('href');
$data_link = file_get_contents($link);
$document_с = phpQuery::newDocument($data_link);
$content = $document_с->find('.td-post-content');
$arr[] = array (
"title" => $title
);
}
echo json_encode($arr, JSON_UNESCAPED_UNICODE);