Handling errors in a PHP class - php

Question

I try to handle errors in a class written in PHP and using curl, this class uses 3 functions (init, sendFirstForm, sendSecondForm) dependent on one another, I test result via nested statements.
I want to manage two types of errors (Curl connection errors and form errors) that requires the sending of an email so I can fix them.
This code does not work.
class Sender {
public $error;
public function __construct() {
$this->error = '';
}
public function send() {
if($this->init() === TRUE) /* account login and retrieval of the cookie */
{
if($this->sendFirstForm() === TRUE) /* sending the first form if connection */
{
if($this->sendSecondForm() === TRUE) /* sending the second form if connection */
{
echo 'Annonce publiée avec succès.';
}
}
}
}
public function init() {
// CuRL : account login and retrieval of the cookie
// ...
curl_setopt($ch, CURLOPT_POSTFIELDS, $postfields);
$result = curl_exec($ch);
if(curl_errno($ch))
{
$this->error = 'CuRL Error : ' . curl_error($ch);
return $this->error;
}
elseif(preg_match("/\bError\b/i", $result)) /* $ _POST data missing and / or incorrect */
{
$this->error = 'Error in the login form';
return $this->error;
mail('name#domain.com', 'Error Curl', 'Error connecting to the account, here are the data sent : ' . $postfields);
}
}
public function sendFirstForm() {
// CuRL : sending the first form
// ...
curl_setopt($ch, CURLOPT_POSTFIELDS, $postfields);
$result = curl_exec($ch);
if(curl_errno($ch))
{
$this->error = 'CuRL Error : ' . curl_error($ch);
return $this->error;
}
elseif(preg_match("/\bError\b/i", $result)) /* $ _POST data missing and / or incorrect */
{
$this->error = 'Error in the first form';
return $this->error;
mail('name#domain.com', 'Error Curl', 'Error sending first form, here are the data sent : ' . $postfields);
}
}
public function sendSecondForm() {
// CuRL : sending the second form
// ...
curl_setopt($ch, CURLOPT_POSTFIELDS, $postfields);
$result = curl_exec($ch);
if(curl_errno($ch))
{
$this->error = 'CuRL Error : ' . curl_error($ch);
return $this->error;
}
elseif(preg_match("/\bError\b/i", $result)) /* $ _POST data missing and / or incorrect */
{
$this->error = 'Error in the second form';
return $this->error;
mail('name#domain.com', 'Error Curl', 'Error sending second form, here are the data sent : ' . $postfields);
}
}
}
$send = new Sender();
$send->Send();
if(empty($send->error))
{
// MySQL treatment
}
else
{
echo $send->error;
}