Convert PDO recordset to JSON in PHP [duplicate] - php

Question

This question already has answers here:
How to create a JSON object
(5 answers)
Closed 2 years ago.
Im using PHP and I need a way to convert an entire recordset to a JSON string.
While searching Stack Overflow I found this solution that works:
function recordSetToJson($mysql_result) {
$rs = array();
while($rs[] = mysql_fetch_assoc($mysql_result)) {
// you don´t really need to do anything here.
}
return json_encode($rs);
}
The problem with this code is that I found that the function mysql_fetch_assoc() is deprecated in PHP 5.5.0. Another thing is that im using PDO to connect to my database.
Given the circunstances above, what would be the best solution to convert a PDO recordset to JSON? I want it to work at later versions of PHP too.

Answer 1

The solution is simple.
Considering that the variable $stmt is your PDO recordset, you can convert it to JSON like this:
json_encode($stmt->fetchAll(PDO::FETCH_ASSOC));
For more info about the functions used in this piece of code:
http://www.php.net/manual/en/function.json-encode.php
http://www.php.net/manual/en/pdostatement.fetchall.php

Answer 2

You should use something like that
somewhere previously
$stmt = $pdo->prepare("SELECT * FROM fruit WHERE name = ?");
$stmt->execute(array("Apple"));
....
function recordSetToJson($stmt) {
$json_result = array();
while($tmp = $stmt->fetch() ) {
$json_result[] = $tmp;
}
return json_encode($json_result);
}
But final solution will be totally depends form too many factors.