Fatal Error with fetch_assoc inside a function - php

Question

I truly need your help. I have seen answers and even followed advice as previously posted but NO SOLUTIONS SHOW how to use fetch associated array using PREPARED STATEMENTS so I am not trying to submit an already answered question. I have followed suggestions to others questions but I am still getting:
Fatal error: Call to a member function fetch_assoc() on a non-object in /xxx/xxxxxx.php on line 75
I am showing you the old code using MySQL and how I have changed it to MySQLi using prepared statements, but I am still getting the same Fatal Error. Can someone please help me, I am going crazy and I truly need to find out what I am doing wrong. Thanks for your help.
//*******************************************************************
// OLD CODE:
// Called by: $theme=$log->get_theme();
//*******************************************************************
class redirect
{
function __construct()
{
}
function get_theme()
{
$rs=mysql_query("select * from theme where status='yes'");
if(mysql_num_rows($rs)>0)
{
$data=mysql_fetch_array($rs);
return $data['theme_name'];
}
}
}
//*********************************************************************
// OLD CODE:
// Called by: $theme=$log->get_theme($cn);
//*********************************************************************
class redirect
{
public $cn;
function __construct()
{
}
function get_theme($cn)
{
$themeStatus = 'yes';
if ($stmt = $cn->prepare("SELECT * FROM theme WHERE status = ? "))
{
$stmt->bind_param("s", $themeStatus);
$result = $stmt->execute();
$stmt->store_result();
if ($stmt->num_rows >= "1")
{
$data = $result->fetch_assoc(); // ERROR LINE
return $data['theme_name'];
}
}
else
{
echo "Failed to execute prepared statement: " . mysqli_connect_error();
}
}
}

Answer 1

The mysqli_stmt::execute method returns only bool by definition. So calling $result->any_method_name() will fail because $result is a boolean value.
To get the values from a prepared statement using the MySQLi library you bind your target variables with $stmt->bind_result(...) and then use $stmt->fetch() in a while loop to get the result of your query in your bound variables. And after that you switch from MySQLi to PDO because it has a better API regarding this…