Correct version sms_sending SMS gateway for OpenCart with addtional phone numbers.

sms_sending.php

<?php

final class sms_sending extends SmsGate {
  
	private $url = 'http://lcab.sms-sending.ru/API/XML/send.php';
  		
	private function GetPageByUrl($headers, $post_body) {
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $this->url); // урл страницы
		curl_setopt($ch, CURLOPT_FAILONERROR, 1);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER,1); // return into a variable
		curl_setopt($ch, CURLOPT_TIMEOUT, 10); // times out after 4s
		curl_setopt($ch, CURLOPT_POST, 1); // set POST method
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
		curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
		curl_setopt($ch, CURLOPT_POSTFIELDS, $post_body); // передаём post-данные
		$result = curl_exec($ch); // получить результат в переменную
		curl_close($ch);
		return $result;
	}	
	
	public function send() {
		// Get additionals phone numbers
		$telephones = array_merge(array($this->to), explode(',', $this->copy));

		$xml = "<?xml version='1.0' encoding='UTF-8'?>
		<data>
			<login>".$this->username."</login>
			<password>".$this->password."</password>";
			foreach ($telephones as $telephone) {
				$xml .= "<to number='".$telephone."'></to>";
			}
			$xml .= "<source>".$this->from."</source>
			<text>".$this->message."</text>
			<flash>".(int)$this->flash."</flash>
		</data>";
		
		$headers[] = 'Content-Type: text/xml; charset=utf-8';
		$headers[] = 'Content-Length: ' . strlen($xml);
		return array("answer" => $this->GetPageByUrl($headers, $xml));
	}

}