+ public function connect($host, $port = null, $timeout = 30, $options = array())
+ {
+ static $streamok;
+ //This is enabled by default since 5.0.0 but some providers disable it
+ //Check this once and cache the result
+ if (is_null($streamok)) {
+ $streamok = function_exists('stream_socket_client');
+ }
+ // Clear errors to avoid confusion
+ $this->setError('');
+ // Make sure we are __not__ connected
+ if ($this->connected()) {
+ // Already connected, generate error
+ $this->setError('Already connected to a server');
+ return false;
+ }
+ if (empty($port)) {
+ $port = self::DEFAULT_SMTP_PORT;
+ }
+ // Connect to the SMTP server
+ $this->edebug(
+ "Connection: opening to $host:$port, timeout=$timeout, options=".var_export($options, true),
+ self::DEBUG_CONNECTION
+ );
+ $errno = 0;
+ $errstr = '';
+ if ($streamok) {
+ $socket_context = stream_context_create($options);
+ //Suppress errors; connection failures are handled at a higher level
+ $this->smtp_conn = @stream_socket_client(
+ $host . ":" . $port,
+ $errno,
+ $errstr,
+ $timeout,
+ STREAM_CLIENT_CONNECT,
+ $socket_context
+ );
+ } else {
+ //Fall back to fsockopen which should work in more places, but is missing some features
+ $this->edebug(
+ "Connection: stream_socket_client not available, falling back to fsockopen",
+ self::DEBUG_CONNECTION
+ );
+ $this->smtp_conn = fsockopen(
+ $host,
+ $port,
+ $errno,
+ $errstr,
+ $timeout
+ );
+ }
+ // Verify we connected properly
+ if (!is_resource($this->smtp_conn)) {
+ $this->setError(
+ 'Failed to connect to server',
+ $errno,
+ $errstr
+ );
+ $this->edebug(
+ 'SMTP ERROR: ' . $this->error['error']
+ . ": $errstr ($errno)",
+ self::DEBUG_CLIENT
+ );
+ return false;
+ }
+ $this->edebug('Connection: opened', self::DEBUG_CONNECTION);
+ // SMTP server can take longer to respond, give longer timeout for first read
+ // Windows does not have support for this timeout function
+ if (substr(PHP_OS, 0, 3) != 'WIN') {
+ $max = ini_get('max_execution_time');
+ // Don't bother if unlimited
+ if ($max != 0 && $timeout > $max) {
+ @set_time_limit($timeout);
+ }
+ stream_set_timeout($this->smtp_conn, $timeout, 0);