PDO - "Call to a member function fetch() on a non-object" - php

Question

I know that error occurs usually when query returned false but this time this occurs with no reason! (or just I'm making a big mistake)
if(!$security_SenderId){
$getbaseticketqry = $this->db->prepare("SELECT * FROM `tickets` WHERE `ticket_safeid` = '?'");
$getbaseticket = $getbaseticketqry->execute(array($ticket_safeid));
}else{
$getbaseticketqry = $this->db->prepare("SELECT * FROM `tickets` WHERE `ticket_safeid` = '?' AND `ticket_sender` = '?'");
$getbaseticket = $getbaseticketqry->execute(array($ticket_safeid, $security_SenderId));
}
if($getbaseticket === false){
return false;
}else{
$baseticket = $getbaseticket->fetch(PDO::FETCH_ASSOC);
}
I've theese lines in a function that returns support ticket information as array but as I said the error occurs when I tried to fetch the ticket information. I tried to check mysql errors just before fetch line by enabling the pdo debug mode and db->errorInfo() but it didn't work.
What can the problem be here?
Edit:
<?php
error_reporting(E_ALL); ini_set('display_errors', 1);
class TICKET_MANAGER
{
function __construct($dbhost, $dbname, $dbuser, $dbpass) {
try{
$this->db = new PDO("mysql:host=$dbhost;dbname=$dbname;charset=utf8", $dbuser, $dbpass);
$this->db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}catch(PDOException $e){
die('Connection failed: ' . $e->getMessage() );
}
}
function viewTicket($ticket_safeid, $security_SenderId = false)
{
try{
if(!$security_SenderId){
$getbaseticketqry = $this->db->prepare("SELECT * FROM `tickets` WHERE `ticket_safeid` = ?");
$getbaseticket = $getbaseticketqry->execute(array($ticket_safeid));
}else{
$getbaseticketqry = $this->db->prepare("SELECT * FROM `tickets` WHERE `ticket_safeid` = ? AND `ticket_sender` = ?");
$getbaseticket = $getbaseticketqry->execute(array($ticket_safeid, $security_SenderId));
}
}catch(PDOException $e){
die('Mysql error: ' . $e->getMessage() );
}
...
}
...
}

Answer 1

It's the quotes around all your '?' - Remove them.
Read the manual
http://php.net/pdo.prepared-statements
from the manual:
$stmt = $dbh->prepare("INSERT INTO REGISTRY (name, value) VALUES (?, ?)");
Exceptions should have told you that error
setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION)
and used right after you've connected to your DB.
-http://php.net/manual/en/pdo.error-handling.php
try {
$dbh = new PDO($dsn, $user, $password);
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch (PDOException $e) {
echo 'Connection failed: ' . $e->getMessage();
}
Query:
try {
// your query
}
catch(PDOException $e){
print $e->getMessage();
}
Add error reporting to the top of your file(s) which will help find errors.
<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);
// rest of your code
Sidenote: Error reporting should only be done in staging, and never production.