Check session

[cluelessPHP]

I'm trying to insert a zero if no session is set, if a session is set it seems to insert the right user id but if a user isn't logged in it won't insert

if ($_SERVER['REQUEST_METHOD'] == 'GET')
	{
		if(!isset($_SESSION['userId']) && !empty($_SESSION['userId'])) {
				$userId = 0;
		}else{
			$userId = $_SESSION['userId'];
		}
		
	$get = filter_input_array(INPUT_GET, FILTER_SANITIZE_STRING);		
	$lat = $lon = $accuracy = "";
	$lat = $get['latitude'];
	$lon = $get['longitude'];
	$accuracy = $get['accuracy'];

	$usersL = new UserLocations();
	$usersL->Userslocations($lat, $lon, $accuracy, $userId);
}

Edit I also tried

<?php
session_start(); 
class UserLocations
{
	public function __construct()
    {
        $db = $db = new Database;
        $db->setAttribute(PDO::ATTR_ERRMODE,PDO::ERRMODE_WARNING);
        $this->db = $db;
    }
		
public function Userslocations($lat, $lon, $accuracy, $userId)
{	
	if(!isset($_SESSION['userId']) && !empty($_SESSION['userId'])) {
			$userId = 0;
	}else{
		$userId = $_SESSION['userId'];
	}
	$this->db->beginTransaction();
	$insert = $this->db->prepare('INSERT INTO userlocations (lat, lon, accuracy, userId)
		VALUES
		(:lat, :lon, :accuracy, :userId)');	
	$insert->execute(array(
	':lat' => $lat,
	':lon' => $lon,
	':accuracy' => $accuracy,
	':userId' => $userId,
	));
	$this->db->commit();
}
}

[cluelessPHP]

Well this worked,

public function Userslocations($lat, $lon, $accuracy, $userId)
	{	
		if(isset($_SESSION['userId']) && !empty($_SESSION['userId'])) {
			$userId = $_SESSION['userId'];
			
	}else{
		$userId = 0;
	}
	$this->db->beginTransaction();
	$insert = $this->db->prepare('INSERT INTO userlocations (lat, lon, accuracy, userId)
		VALUES
		(:lat, :lon, :accuracy, :userId)');	
	$insert->execute(array(
	':lat' => $lat,
	':lon' => $lon,
	':accuracy' => $accuracy,
	':userId' => $userId,
	));
	$this->db->commit();
}

[NogDog]

This looks contradictory:

		if(!isset($_SESSION['userId']) && !empty($_SESSION['userId'])) {
				$userId = 0;
		}else{
			$userId = $_SESSION['userId'];
		}

I think all you really need, since empty() includes a !isset() check, is:

		if(empty($_SESSION['userId'])) {
			$userId = 0;
		}else{
			$userId = $_SESSION['userId'];
		}

Or you could have ternary operator fun:

$userId = empty($_SESSION['userId']) ? 0 : $_SESSION['userId'];

[cluelessPHP]

oh ternary operator fun it is