No errors given and script isn't executed - php

Question

As stated in the question before this, I have a registration system on my website and I am updating my mysql statements to PDO statements. I have updated all the statements and now the script runs through but it doesn't execute any of the script and doesn't give me any errors. It redirects me back to the registration.php page.
reg.php
<?php
include("sql.php");
require("includes/password.php");
session_start(); //Start session for writing
$errmsg = array(); //Array to store errors
$noterr = array();
$errflag = false; //Error flag
function UniqueID() {
include("sql.php");
$UID = rand(); //Create unique ID
$check = $db->prepare('SELECT * FROM `users` WHERE `UID` = :UID');
$UIDarray = array(
UID => $UID
);
$check->execute($UIDarray);
if($check->fetchColumn() > 0) { //Check if it exists
UniqueID(); //Redo the function
} else {
return $UID; //return the uniqueid
}
}
$UID = UniqueID(); //Unique ID
$username = ($_POST['username']); //Username
$email = $_POST['email']; //Email
password_hash($_POST['password'], PASSWORD_BCRYPT, array("cost" => 10)); //Password
password_hash($_POST['rpassword'], PASSWORD_BCRYPT, array("cost" => 10)); //Repeated Password
//Check Username
if($username == '') {
$errmsg[] = '<span style="color: red;">Where is your username?</span>'; //Error
$errflag = true; //Set flag so it says theres an error
}
//Check Password
if($password == '') {
$errmsg[] = '<span style="color: red;">Oops! No password!</span>'; //Error
$errflag = true; //Set flag so it says theres an error
}
//Check Repeated Password
if($rpassword == '') {
$errmsg[] = '<span style="color: red;">Your repeated password is missing!</span>'; //Error
$errflag = true; //Set flag so it says theres an error
}
//Make sure passwords match
if(strcmp($password, $rpassword) != 0 ) {
$errmsg[] = '<span style="color: red;">Passwords do not match</span>'; //Error
$errflag = true; //Set flag so it says theres an error
}
//Make sure username is availible
if($username != '') {
$qry = $db->prepare("SELECT * FROM `users` WHERE `Username` = :username"); //MySQL query
$params = array(
username => $username
);
$qry->execute($params);
if($qry->execute($params)) {
if($qry->fetchColumn() > 0) { //If username is in use
$errmsg[] = '<span style="color: red;">Sorry, that username is already in use</span>'; //Create error
$errflag = true; //Set flag so it says theres an error
}
$qry->closeCursor();
}
}
if(isset($_POST["captcha"])&&$_POST["captcha"]!=""&&$_SESSION["code"]==$_POST["captcha"])
{
}
else
{
$errmsg[] = '<span style="color: red;">That is not what the picture displayed!</span>'; // Create error
$errflag = true; //Set flag so it says theres an error
}
//If there are input validations, redirect back to the registration form
if($errflag) {
$_SESSION['ERRMSG'] = $errmsg; //Write errors
session_write_close(); //Close session
header("location: register.php"); //Rediect
exit(); //Block scripts
}
//Create INSERT query
$query = $db->prepare("INSERT INTO `userauthenticate`.`users`(`UID`, `Username`, `Email`, `Password`) VALUES(:UID,:username,:email,:password)");
$params2 = array(
UID => $UID,
username => $username,
email => $email,
password => $password
);
$query->execute($params2);
//Check whether the query was successful or not
if($query->execute($params2)) {
header("Location: login.php");
exit();
} else {
die("There was an error, try again later");
}
?>
sql.php
<?php
ob_start();
session_start();
//database credentials
$dbhost = 'dbhost';
$dbuser = 'dbuser';
$dbpass = 'dbpass';
$dbname = 'dbname';
$db = new PDO("mysql:host=$dbhost;dbname=$dbname", $dbuser, $dbpass);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
?>

Answer 1

It might be worth adding some try/catch blocks to catch any errors if there are any
//Make sure username is availible
if($username != '') {
try {
$qry = $db->prepare("SELECT * FROM `users` WHERE `Username` = :username"); //MySQL query
$params = array(
username => $username
);
$result = $qry->execute($params);
if($result) {
if($qry->fetchColumn() > 0) { //If username is in use
$errmsg[] = '<span style="color: red;">Sorry, that username is already in use</span>'; //Create error
$errflag = true; //Set flag so it says theres an error
}
$qry->closeCursor();
}
}
catch(PDOException e) {
// write the error to the log
$errmsg = $e->getMessage();
error_log('$errmsg-> '.$errmsg);
echo $errmsg;
}
}
if(isset($_POST["captcha"]) && $_POST["captcha"] !="" && $_SESSION["code"] == $_POST["captcha"])
{
}
else
{
$errmsg[] = '<span style="color: red;">That is not what the picture displayed!</span>'; // Create error
$errflag = true; //Set flag so it says theres an error
}
//If there are input validations, redirect back to the registration form
if($errflag) {
$_SESSION['ERRMSG'] = $errmsg; //Write errors
session_write_close(); //Close session
header("location: register.php"); //Rediect
exit(); //Block scripts
}
try {
//Create INSERT query
$query = $db->prepare("INSERT INTO `userauthenticate`.`users`(`UID`, `Username`, `Email`, `Password`) VALUES (:UID,:username,:email,:password)");
$params2 = array(
UID => $UID,
username => $username,
email => $email,
password => $password
);
$result $query->execute($params2);
}
catch(PDOException e) {
// write the error to the log
$errmsg = $e->getMessage();
error_log('$errmsg-> '.$errmsg);
echo $errmsg;
}
//Check whether the query was successful or not
if($result) {
header("Location: login.php");
exit();
} else {
die("There was an error, try again later");
}
?>