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php - how to force the server to respond as json

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I had a problem withStreamBuilder in flutter app here Geting data from mysql to StreamBuilder Flutter

and now I want to force the server to pass the data as JSON this my php codedb.php

<?php

$dns = 'mysql:host=localhost;dbname=id13424627_flutter';
$user = 'id13424627_flutter_app';
$pass = 'Flutter_maen12';

try{
  $db = new PDO ($dns, $user, $pass);
  echo 'connected';
}catch( PDOException $e){
    $error = $e->getMessage();
    echo $error;
}
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get.php

<?php
require_once('db.php');
$query = 'SELECT * FROM flutter';
$stm = $db->prepare($query);
$stm->execute();
$row = $stm->fetch(PDO::FETCH_ASSOC);
echo json_encode($row);
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Undefined asked

2021-09-2

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736

votes

Answer

Solution:

Try to delete this anecho 'connected'; and add the top of your get.php file;

header("Content-type: application/json; charset=utf-8");
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Date the issue was resolved:

2021-09-2

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About the technologies asked in this question

PHP

PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites. The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
https://www.php.net/

MySQL

DBMS is a database management system. It is designed to change, search, add and delete information in the database. There are many DBMSs designed for similar purposes with different features. One of the most popular is MySQL. It is a software tool designed to work with relational SQL databases. It is easy to learn even for site owners who are not professional programmers or administrators. MySQL DBMS also allows you to export and import data, which is convenient when moving large amounts of information.
https://www.mysql.com/