5.x SMTP.php

public SMTP::connect($host, $port = null, $timeout = 30, $options =[])

Connect to an SMTP server.

Parameters

string $host SMTP server IP or host name:

int $port The port number to connect to:

int $timeout How long to wait for the connection to open:

array $options An array of options for stream_context_create():

Return value

bool

File

inc/PHPMailer/src/SMTP.php, line 289

Class

SMTP

PHPMailer RFC821 SMTP email transport class. Implements RFC 821 SMTP commands and provides some utility methods for sending mail to an SMTP server.

Code

public function connect($host, $port = null, $timeout = 30, $options =[]) {
  static $streamok;
  //This is enabled by default since 5.0.0 but some providers disable it
  //Check this once and cache the result
  if (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_PORT;
  }
  // Connect to the SMTP server
  $this->edebug("Connection: opening to $host:$port, timeout=$timeout, options=" . (count($options) > 0 ? var_export($options, true) : 'array()'), self::DEBUG_CONNECTION);
  $errno = 0;
  $errstr = '';
  if ($streamok) {
    $socket_context = stream_context_create($options);
    set_error_handler([$this 'errorHandler']);
    $this->smtp_conn = stream_socket_client($host . ':' . $port, $errno, $errstr, $timeout, STREAM_CLIENT_CONNECT, $socket_context);
    restore_error_handler();
  }
  else {
    //Fall back to fsockopen which should work in more places, but is missing some features
    $this->edebug('Connection: stream_socket_client not available, falling back to fsockopen', self::DEBUG_CONNECTION);
    set_error_handler([$this 'errorHandler']);
    $this->smtp_conn = fsockopen($host, $port, $errno, $errstr, $timeout);
    restore_error_handler();
  }
  // Verify we connected properly
  if (!is_resource($this->smtp_conn)) {
    $this->setError('Failed to connect to server', '', (string) $errno, (string) $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 (0 != $max and $timeout > $max) {
      @set_time_limit($timeout);
    }
    stream_set_timeout($this->smtp_conn, $timeout, 0);
  }
  // Get any announcement
  $announce = $this->get_lines();
  $this->edebug('SERVER -> CLIENT: ' . $announce, self::DEBUG_SERVER);

  return true;
}