如何使用PHP将mysql结果转换为JSON对象

Question

I am trying to convert a mysql resource id to JSON object to be sent as a response for ajax call this is the code that I´ve tried to use

<?php
require_once 'config.php';
$sql="SELECT * FROM `inquiry` WHERE 1";
$res=mysql_query($sql);
if($res)
echo json_encode($res);
?>

and I get this error message

Warning: [json] (php_json_encode) type is unsupported, encoded as null in /home/smartco/public_html/kb/q.php on line 6

null

how can I do it

Answer 1

Change your code something to

$res = mysql_query($sql);
while($data = mysql_fetch_array($res)) {
 $output[] = $data;
}
echo json_encode($output);

You're encoding the resource id.