Rows from DB to JSON

<?php
require_once 'DB_FILE_HERE';

// SQL statement
$sql = mysqli_query($conn, "QUERY_HERE");

// Define array for row
$rows = array();

// Set each row into array.
while ($row = $sql->fetch_assoc()) {
	$rows[] = $row;
}

// Echo JSON array
print json_encode($rows);