Question

How do I use the json_encode() function with MySQL query results? Do I need to iterate through the rows or can I just apply it to the entire results object?

Answer 1

$sth = mysqli_query($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

Modern PHP versions support mysqli_fetch_all() function that will get your array in one go

$result = mysqli_query($conn, "SELECT ..."); $rows = mysqli_fetch_all($result); // list arrays with values only in rows // or $rows = mysqli_fetch_all($result, MYSQLI_ASSOC); // assoc arrays in rows  print json_encode($rows);