How to convert mysqli query results to JSON format?

Question

I have a mysqli query that I need to format into JSON for a mobile application.

I have successfully generated an XML document of the query results, but I'm looking for a more lightweight solution. (See current XML code below)

$mysql = new mysqli(DB_SERVER,DB_USER,DB_PASSWORD,DB_NAME) or die('There was a problem connecting to the database');

$stmt = $mysql->prepare('SELECT DISTINCT title FROM sections ORDER BY title ASC');
$stmt->execute();
$stmt->bind_result($title);

//Create xml format
$doc = new DomDocument('1.0');

//Create root node
$root = $doc->createElement('xml');
$root = $doc->appendChild($root);

//Add nodes to each row
while($row = $stmt->fetch()) :

    $occ = $doc->createElement('data');
    $occ = $root->appendChild($occ);

    $child = $doc->createElement('section');
    $child = $occ->appendChild($child);
    $value = $doc->createTextNode($title);
    $value = $child->appendChild($value);

endwhile;

$xml_string = $doc->saveXML();

header('Content-Type: application/xml; charset=ISO-8859-1');

// Output xml, jQuery is ready

echo $xml_string;

Answer 1

This is how I create the JSON feed:

$mysqli = new mysqli('localhost', 'user', 'password', 'myDatabaseName');
$myArray = array();
if ($result = $mysqli->query("SELECT * FROM phase1")) {
    $tempArray = array();
    while ($row = $result->fetch_object()) {
        $tempArray = $row;
        array_push($myArray, $tempArray);
    }
    echo json_encode($myArray);
}

$result->close();
$mysqli->close();

Answer 2

Just create an array from the query results and encode it

$mysqli = new mysqli('localhost','user','password','myDatabaseName');
$myArray = array();
$result = $mysqli->query("SELECT * FROM phase1");
while($row = $result->fetch_assoc()) {
    $myArray[] = $row;
}
echo json_encode($myArray);

The output results are as follows:

[
    {"id":"31","name":"product_name1","price":"98"},
    {"id":"30","name":"product_name2","price":"23"}
]

If you want another style, you can change fetch_assoc() to fetch_row() and get the following output:

[
    ["31","product_name1","98"],
    ["30","product_name2","23"]
]