JSON encode MySQL results
$sth = mysqli_query($conn, "SELECT ...");$rows = array();while($r = mysqli_fetch_assoc($sth)) { $rows[] = $r;}print json_encode($rows);The function json_encode needs PHP >= 5.2 and the php-json package - as mentioned here
NOTE: mysql is deprecated as of PHP 5.5.0, use mysqli extension instead http://php.net/manual/en/migration55.deprecated.php.
http://www.php.net/mysql_query says "mysql_query() returns a resource".
http://www.php.net/json_encode says it can encode any value "except a resource".
You need to iterate through and collect the database results in an array, then json_encode the array.