The example in this article describes how PHP implements SMTP to send emails based on sockets. Share it with everyone for your reference. The specific analysis is as follows:
php uses socket to send emails through SMTP.
Using the php-sockets extension of php, you can send emails in plain text and html formats. The code is as follows:
The code is as follows:
/**
* Email sending class
* Supports sending plain text emails and HTML format emails
* @example
* $config = array(
* "from" => "*****",
* "to" => "***",
* "subject" => "test",
* "body" => "test",
* "username" => "***",
* "password" => "****",
* "isHTML" => true
* );
*
* $mail = new MySendMail();
*
* $mail->setServer("smtp.126.com");
*
* $mail->setMailInfo($config);
* if(!$mail->sendMail()) {
* echo $mail->error();
* return 1;
* }
*/
class MySendMail {
/**
* @var Mail transfer agent username
* @access private
*/
private $_userName;
/**
* @var Mail transfer agent password
* @access private
*/
private $_password;
/**
* @var Mail transfer proxy server address
* @access protected
*/
protected $_sendServer;
/**
* @var Mail transfer proxy server port
* @access protected
*/
protected $_port=25;
/**
* @var sender
* @access protected
*/
protected $_from;
/**
* @var recipient
* @access protected
*/
protected $_to;
/**
* @var theme
* @access protected
*/
protected $_subject;
/**
* @var Email text
* @access protected
*/
protected $_body;
/**
* @var Whether it is an email in HTML format
* @access protected
*/
protected $_isHTML=false;
/**
* @var socket resource
* @access protected
*/
protected $_socket;
/**
* @var error message
* @access protected
*/
protected $_errorMessage;
public function __construct($from="", $to="", $subject="", $body="", $server="", $username="", $password="",$isHTML="", $port="") {
if(!empty($from)){
$this->_from = $from;
}
if(!empty($to)){
$this->_to = $to;
}
if(!empty($subject)){
$this->_subject = $subject;
}
if(!empty($body)){
$this->_body = $body;
}
if(!empty($isHTML)){
$this->_isHTML = $isHTML;
}
if(!empty($server)){
$this->_sendServer = $server;
}
if(!empty($port)){
$this->_port = $port;
}
if(!empty($username)){
$this->_userName = $username;
}
if(!empty($password)){
$this->_password = $password;
}
}
/**
* Set up mail transfer agent
* @param string $server The IP or domain name of the proxy server
* @param int $port proxy server port, smtp default port 25
* @param int $localPort local port
* @return boolean
*/
public function setServer($server, $port=25) {
if(!isset($server) || empty($server) || !is_string($server)) {
$this->_errorMessage = "first one is an invalid parameter";
return false;
}
if(!is_numeric($port)){
$this->_errorMessage = "first two is an invalid parameter";
return false;
}
$this->_sendServer = $server;
$this->_port = $port;
return true;
}
/**
* Set up email
* @access public
* @param array $config email configuration information
* Contains verification information of email sender, recipient, subject, content, and email transfer agent
* @return boolean
*/
public function setMailInfo($config) {
if(!is_array($config) || count($config) < 6){
$this->_errorMessage = "parameters are required";
return false;
}
$this->_from = $config['from'];
$this->_to = $config['to'];
$this->_subject = $config['subject'];
$this->_body = $config['body'];
$this->_userName = $config['username'];
$this->_password = $config['password'];
if(isset($config['isHTML'])){
$this->_isHTML = $config['isHTML'];
}
return true;
}
/**
* Send email
* @access public
* @return boolean
*/
public function sendMail() {
$command = $this->getCommand();
$this->socket();
foreach ($command as $value) {
if($this->sendCommand($value[0], $value[1])) {
continue;
}
else{
return false;
}
}
$this->close(); //In fact, there is no need to close here. After the smtp command: QUIT is issued, the server closes the connection and the local socket resources will be automatically released
echo 'Mail OK!';
return true;
}
/**
* Return error message
* @return string
*/
public function error(){
if(!isset($this->_errorMessage)) {
$this->_errorMessage = "";
}
return $this->_errorMessage;
}
/**
* Return to mail command
* @access protected
* @return array
*/
protected function getCommand() {
if($this->_isHTML) {
$mail = "MIME-Version:1.0rn";
$mail .= "Content-type:text/html;charset=utf-8rn";
$mail .= "FROM:test<" . $this->_from . ">rn";
$mail .= "TO:<" . $this->_to . ">rn";
$mail .= "Subject:" . $this->_subject ."rnrn";
$mail .= $this->_body . "rn.rn";
}
else{
$mail = "FROM:test<" . $this->_from . ">rn";
$mail .= "TO:<" . $this->_to . ">rn";
$mail .= "Subject:" . $this->_subject ."rnrn";
$mail .= $this->_body . "rn.rn";
}
$command = array(
array("HELO sendmailrn", 250),
array("AUTH LOGINrn", 334),
array(base64_encode($this->_userName) . "rn", 334),
array(base64_encode($this->_password) . "rn", 235),
array("MAIL FROM:<" . $this->_from . ">rn", 250),
array("RCPT TO:<" . $this->_to . ">rn", 250),
array("DATArn", 354),
array($mail, 250),
array("QUITrn", 221)
);
return $command;
}
/**
* @access protected
* @param string $command SMTP command sent to the server
* @param int $code Is the response expected from the server?
* @param boolean
*/
protected function sendCommand($command, $code) {
echo 'Send command:' . $command . ',expected code:' . $code . '
';
//Send command to server
try{
if(socket_write($this->_socket, $command, strlen($command))){
//Read server returns
$data = trim(socket_read($this->_socket, 1024));
echo 'response:' . $data . '
';
if($data) {
$pattern = "/^".$code."/";
if(preg_match($pattern, $data)) {
return true;
}
else{
$this->_errorMessage = "Error:" . $data . "|**| command:";
return false;
}
}
else{
$this->_errorMessage = "Error:" . socket_strerror(socket_last_error());
return false;
}
}
else{
$this->_errorMessage = "Error:" . socket_strerror(socket_last_error());
return false;
}
}catch(Exception $e) {
$this->_errorMessage = "Error:" . $e->getMessage();
}
}
/**
* Establish a network connection to the server
* @access private
* @return boolean
*/
private function socket() {
if(!function_exists("socket_create")) {
$this->_errorMessage = "extension php-sockets must be enabled";
return false;
}
//Create socket resource
$this->_socket = socket_create(AF_INET, SOCK_STREAM, getprotobyname('tcp'));
if(!$this->_socket) {
$this->_errorMessage = socket_strerror(socket_last_error());
return false;
}
//Connect to server
if(!socket_connect($this->_socket, $this->_sendServer, $this->_port)) {
$this->_errorMessage = socket_strerror(socket_last_error());
return false;
}
socket_read($this->_socket, 1024);
return true;
}
/**
* 关闭socket
* @access private
* @return boolean
*/
private function close() {
if(isset($this->_socket) && is_object($this->_socket)) {
$this->_socket->close();
return true;
}
$this->_errorMessage = "no resource can to be close";
return false;
}
}
/**************************** Test ***********************************/
$config = array(
"from" => "XXXXX",
"to" => "XXXXX",
"subject" => "test",
"body" => "test",
"username" => "XXXXX",
"password" => "******",
//"isHTML" => true
);
$mail = new MySendMail();
$mail->setServer("smtp.126.com");
$mail->setMailInfo($config);
if(!$mail->sendMail()) {
echo $mail->error();
return 1;
}
I hope this article will be helpful to everyone’s PHP programming design.