encoding multidimensional array in PHP 7.0 doesn't work (json_encode)

Question

I have a problem with getting JSON data from mysql phpmyadmin(Version 4.0) table, I have tried PDO and mysql_connect.

My idea: mysql--> PHP--> echo json

The connection to my server works and the SQL statement works perfectly. I have tested it. But the "json_encode"(and some others) of the JSON itself is not possible. The json array is not builted.

Are there settings in PhpMyAdmin which I have to pay attention to?

PDO:

      $query = $pdo->prepare('SELECT p.*, count(r.rate) AS rates, avg(r.rate) AS average from plugins p left join rate r on p.title = r.title group by p.title');
        $query->execute();
        $row = $query->fetchAll();
        // send the data encoded as JSON
        $json = json_encode($row, JSON_UNESCAPED_UNICODE);
echo $json;
       print_r($row);
        exit;

Result is:

Array ( [0] => Array ( [id] => 153 [0] => 153 [title] =>

Where am I going wrong? I updated my server to PHP 7.0 and now the code doesn't work. Before the update all is working perfectly and there was a long json array(how it should be)

How it should be

{{"id":"1","title":"ExmapleTitle"....},{"id":"2","title":"ExmapleTitle2"....}...} 

Answer 1

You must call execute()

    <?php

    $pdo = new PDO('mysql:host=xxxxx;dbname=xxxxx', 'xxxxxx', 'xxxxxx');

    $statement=$pdo->prepare("SELECT p.*, count(r.rate) AS rates, avg(r.rate) AS average from plugins p left join rate r on p.title = r.title group by p.title");

    $statement->execute(); // <<< --- You are missing this
    $data = $statement->fetchAll(PDO::FETCH_ASSOC);
    echo json_encode($data); //Echo: data ... voila