Syntax error while executing a sql request with parameters in symfony? - php

Question

I have a just simple problem I guess, I followed Symfony 4.3 documentation, and tried to do do exactly what they have done to execute a SQL request, but I get an error when passing parameters in the execute method, but I get no error while executing the same code but without passing parameters to the request.
I tried this and it worked:
$conn = $this->getDoctrine()->getManager()->getConnection();
$sql = '
SELECT * FROM question_comment WHERE question=2 LIMIT 0, 3';
$stmt = $conn->prepare($sql);
$stmt->execute();
var_dump($stmt->fetchAll());
But this does not work, I get a syntax error:
$question = $request->query->get('question');
$row = $request->query->get('row');
$question = intval($question);
$beggining = intval($row*3);
$conn = $this->getDoctrine()->getManager()->getConnection();
$sql = '
SELECT * FROM question_comment WHERE question=:question LIMIT :beggining , 3';
$stmt = $conn->prepare($sql);
$stmt->execute(['question' => $question, 'beggining' => $beggining]);
var_dump($stmt->fetchAll());
This is the error:
An exception occurred while executing ' SELECT * FROM question_comment
WHERE question= :question LIMIT :beggining , 3' with params [2, 0]:
SQLSTATE[42000]: Syntax error or access violation: 1064 You have an
error in your SQL syntax; check the manual that corresponds to your
MySQL server version for the right syntax to use near ''0' , 3' at
line 1
Here is what I have followed, I did exactly what was there, but its not working.
I tried this solution to bind my parameters but it did not work too :
$sql = '
SELECT * FROM question_comment WHERE question=:question LIMIT :beggining , 3';
$stmt = $conn->prepare($sql);
$stmt->bindParam(':question', $question, \PDO::PARAM_INT);
$stmt->bindParam(':beginning', $beginning, \PDO::PARAM_INT);
$stmt->execute();
And I got this :
An exception occurred while executing ' SELECT * FROM question_comment
WHERE question=:question LIMIT :beggining , 3' with params [2, null]:
SQLSTATE[HY093]: Invalid parameter number: parameter was not defined

Answer 1

alternative way to bind parameters is using this.
$stmt->bindParam(':question', $question, PDO::PARAM_STR);
$stmt->bindParam(':beginning', $beginning, PDO::PARAM_INT);
or to make it sure you binded the $beginning parameter, cast it to int.
$stmt->bindValue(':beginning', (int)trim($beginning), PDO::PARAM_INT);
or if you want to stick on your existing code.
$stmt->execute(['question' => $question, 'beggining' => (int)trim($beggining)]);