PHP call to undefined method - pdo instantiation - php

Question

I recently started to resurrect an old PHP4.# website. In doing so I've been trying to figure out the conversion to PDO. After so many different attempts at PDO structure I'm getting lost and my code keeps getting more and more wild. I believe the problem is that I'm not correctly instantiating the pdo class but have failed using several different methods.
Fatal error: Uncaught Error: Call to undefined method DBInsert::__construct() in /home/folder/database/insert.php:36
mysqlhelper.php
<?php
class MySQLHelper
{
private $link;
private $db;
private $user;
private $pass;
var $pdo;
public function __construct()
{
$host = 'localhost';
$db = 'dbname';
$user = 'username';
$pass = 'supersecret';
$port = '1111';
$options = [
\PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
\PDO::ATTR_DEFAULT_FETCH_MODE => \PDO::FETCH_ASSOC,
\PDO::ATTR_EMULATE_PREPARES => false,
];
try {
$dsn = "mysql:host=$host;dbname=$db;port=$port";
$this->pdo = new PDO($dsn, $user, $pass, $options);
return $this->pdo;
} catch (\PDOException $e) {
throw new \PDOException($e->getMessage(), (int)$e->getCode());
echo "Connection failed";
}
}
function __destruct()
{
// Closing connection
$this->pdo = null;
}
public function query($query)
{
// Performing SQL query
$result = $this->pdo->query($query) or die('Query failed: ' . mysql_error());
return $result;
}
insert.php
<?php
include "../helpers/mysqlhelper.php";
class DBInsert
{
private $helper;
private $nations;
private $nations_updated;
private $stagedslots;
private $stagednations_new; // nations that need to be inserted
private $stagednations_old; // nations that need to be updated
var $pdo;
//this function was previously called __construct() prior to my 11/22/20 updates
function somethingelse()
{
$this->helper = new MySQLHelper();
$this->stagedslots = array();
$this->nations_updated = array();
$this->nations = array();
$q = "SELECT * FROM `nations`";
$result = $this->helper->query($q);
$result = $this->helper->getResultArray($result);
foreach ($result as $val)
{
$this->nations[$val["id"]] = $val;
}
}
public function clearSlots()
{
$sql = "DELETE FROM `slots`;";
$object = new MySQLHelper;
$object->__construct();
line 36 $stmt = $this->__construct()->prepare($sql);
$stmt->execute();
}
For line 36 I've also tried $stmt = $this->pdo->prepare($sql); which yields errors also.
Appreciate any suggestions.

Answer 1

$object = new MySQLHelper;
$object->__construct();
$stmt = $this->__construct()->prepare($sql);
You are writing the same thing three times here:
You make a new object $object and then you do not need to call __construct because by making the object it automatically calls the constructor already.
$sql = "DELETE FROM `slots`;";
$object = new MySQLHelper; //automaticcally calls the constructor
$stmt = $object->prepare($sql);
$stmt->execute();
$stmt->close(); // close connection.
READ THIS