+ /**
+ * Get SMTP extensions available on the server
+ * @access public
+ * @return array|null
+ */
+ public function getServerExtList()
+ {
+ return $this->server_caps;
+ }
+
+ /**
+ * A multipurpose method
+ * The method works in three ways, dependent on argument value and current state
+ * 1. HELO/EHLO was not sent - returns null and set up $this->error
+ * 2. HELO was sent
+ * $name = 'HELO': returns server name
+ * $name = 'EHLO': returns boolean false
+ * $name = any string: returns null and set up $this->error
+ * 3. EHLO was sent
+ * $name = 'HELO'|'EHLO': returns server name
+ * $name = any string: if extension $name exists, returns boolean True
+ * or its options. Otherwise returns boolean False
+ * In other words, one can use this method to detect 3 conditions:
+ * - null returned: handshake was not or we don't know about ext (refer to $this->error)
+ * - false returned: the requested feature exactly not exists
+ * - positive value returned: the requested feature exists
+ * @param string $name Name of SMTP extension or 'HELO'|'EHLO'
+ * @return mixed
+ */
+ public function getServerExt($name)
+ {
+ if (!$this->server_caps) {
+ $this->setError('No HELO/EHLO was sent');
+ return null;
+ }
+
+ // the tight logic knot ;)
+ if (!array_key_exists($name, $this->server_caps)) {
+ if ($name == 'HELO') {
+ return $this->server_caps['EHLO'];
+ }
+ if ($name == 'EHLO' || array_key_exists('EHLO', $this->server_caps)) {
+ return false;
+ }
+ $this->setError('HELO handshake was used. Client knows nothing about server extensions');
+ return null;
+ }
+
+ return $this->server_caps[$name];
+ }
+