I have a website where a user can log in from two different locations. I’m running into an issue when I attempt to manage the error handeling for empty input logins and invalid logins. Essentially what is happening is when either one of the error condtions are met my php script is running a redirect incorrectly. It is redirecting to https://www.website.com/www.website.com?error=emptyinput instead of https://www.website.com?error=emptyinput Any assistance in resolving this issue would be great.

Login Function

function loginUser ($username, $password, $conn){
    //require_once 'PasswordHash.php';
    $uidExists = uidExists($conn, $username, $username);
    if ($uidExists === false) {
        $result = false;
            $referer = basename($_SERVER['HTTP_REFERER']);
        if (strpos($referer, '?') !== false) {
        $errorUrl = $referer . "&error=wrongLogin";
    } else {
        $errorUrl = $referer . "?error=wrongLogin";
    }
        header("location: ../".$errorUrl);
        exit();
    }
    $pwdHashed = $uidExists ['password'];
    $password= $_POST['pwd'];
    $checkPwd = password_verify($password, $pwdHashed);
    if ($checkPwd === false) {
                $referer = basename($_SERVER['HTTP_REFERER']);
        if (strpos($referer, '?') !== false) {
        $errorUrl = $referer . "&error=wrongLogin";
    } else {
        $errorUrl = $referer . "?error=wrongLogin";
    }
        header("location: ../".$errorUrl);
        exit();
    }else if ($checkPwd === true) {
        $result = true;
            session_start();
            $_SESSION["userid"] = $uidExists ["id"];
            $_SESSION["useruid"] = $uidExists ["username"];
            $_SESSION["role"] = $uidExists["role"];
            $userID = $uidExists ["id"];
            if ($uidExists['resetFlag']!=0) {
                header("location: ../profile.php?resetFlag=1");
            }else{
            header("location: ../dashboard.php");
        }
            
    }
    return $result;  
}

Login.inc.php

<?php 
session_start();
if (isset($_POST["submit"])) {
$username = $_POST['uid'];
    $password = $_POST['pwd'];
    
    require_once 'functions.inc.php';
    require_once 'dbh.inc.php';

    if (isset($_POST['data'])){
        if (emptyInputLogin($username, $password) !== false) {
    $referer = basename($_SERVER['HTTP_REFERER']);
        if (strpos($referer, '?') !== false) {
        $errorUrl = $referer . "&error=emptyinput";
    } else {
        $errorUrl = $referer . "?error=emptyinput";
    }
        header("location: ../".$errorUrl);
        exit();
    }
        $data = $_SESSION['idata'];
        $locoData = $_SESSION['locoData'];
        uploadLogin($conn, $username, $password, $data, $locoData);
    }else{
    
    

    if (emptyInputLogin($username, $password) !== false) {
        $referer = basename($_SERVER['HTTP_REFERER']);
        if (strpos($referer, '?') !== false) {
        $errorUrl = $referer . "&error=emptyinput";
    } else {
        $errorUrl = $referer . "?error=emptyinput";
    }
        header("location: ../".$errorUrl);
        exit();
    }

    loginUser($username, $password, $conn);
}
}else{
    header("location: ../login.php");
}