PHP: Script failing after PDO query - php

Question

During my create user process I make a few queries to various database's to get the new user setup. This script has been working fine for about a year and a half, but now something is off.
So the first thing I do is I check to see if a user exists with the credentials being submitted. I've thoroughly tested the check and I'm confident my issue isn't there.
If that check comes back false then the script continues to create the user.
public function registerUser() {
parse_str($_SERVER['QUERY_STRING'], $data);
$data = (object) $data;
$check = json_decode($this->checkUserExists($data->email));
if ($check->res) {
$res = new \stdClass();
$res->res = false;
$res->user_status = $check->user_status;
$res->msg = 'User exists.';
echo json_encode($res);
}
if (!$check->res) {
$this->createUser($data);
}
}
The problem arises after all the queries have been completed, the script does not seem to want to run the if statement at the bottom. I marked it with comment characters so it's easier to find, but I included the entire function for clarity, maybe I'm doing something that is causing the issue.
I tried invoking an error manually at various points during the script. And I am able to trigger an error all the way down to the bottom of the script.
private function createUser($data) {
$Crypt = new CryptController();
$AuthSelect = new AuthController();
$Time = new TimeController();
$remote_address = new RemoteAddressController();
$Session = new SessionController();
$AuthInsert = new AuthModel_Insert();
$hashed_password = $Crypt->create_hash($data->password);
$data->password = '';
$AuthData = json_decode($AuthSelect->getAuth());
$system_auth_id = $AuthData->system_auth_id;
$user_id = $Crypt->get_uuid();
$user_auth_id = $Crypt->get_uuid();
$user_createddate = $Time->time();
$user_updateddate = $Time->time();
$user_lastupdateddate = $Time->time();
$agent_ip = $remote_address->getIpAddress();
$userData = $this->createUserObject(
$user_id,
$user_auth_id,
$system_auth_id,
$hashed_password,
$user_createddate,
$user_updateddate,
$user_lastupdateddate,
$data
);
$agentData = $this->createAgentObject(
$user_id,
$agent_ip,
$data
);
//////////////////////////////////////////
$create_user = $AuthInsert->createNewUser(
$userData
);
$create_user_agent = $this->setUserAgent(
$agentData
);
$sessionKeyData = new \stdClass();
$sessionKeyData->user_id = $user_id;
$sessionKeyData->user_auth_id = $user_auth_id;
$sessionKeyData->system_auth_id = $system_auth_id;
$sessionKeyData->agent_id = $create_user_agent->agent->agent_id;
$set_session_key = $Session->setSessionKey(
$sessionKeyData
);
$send_activation_email = $this->createUserActivation(
$userData
);
if (
$create_user &&
$create_user_agent->res &&
$set_session_key->res &&
$send_activation_email->res) {
$res = new \stdClass();
$res->res = true;
$res->msg = 'New user successfully created.';
echo json_encode($res);
} else {
$res = new \stdClass();
$res->res = false;
$res->msg = 'Error: User creation process incomplete.';
echo json_encode($res);
}
//////////////////////////////////////////
trigger_error("Invoked Error: ",E_USER_ERROR);
}
The queries themselves go through just fine, all the tables are populated just fine. The issue is that after that happens the script doesn't finish. It seems to end the createUser() function and return to the registerUser() function at which point the user will exist so it will return false and echo that back to the client.
In my testing it seems my issue might be at the bottom with that if statement. But I've tested each of those queries individually and they do return the desired booleans to get the true condition. But, even the false condition doesn't go through which should return 'Error: User creation process incomplete.'. That doesn't happen either.
I'm hoping someone sees something I'm missing because I've been stuck on this problem for too long. I appreciate any guidance that might lead me to an answer. Thanks in advance.
Just for clarification the message I'm getting back is $res->msg = 'User exists.'; which comes from registeruser(). The message I'm expecting back is $res->msg = 'New user successfully created.'; which should come from createUser().