mail.php

<?php

/**
 * Mail 邮件发送类
 * 通过 SMTP 协议发送邮件
 * 无需 PHP 扩展支持
 */
class Mail
{
	protected $config;

	/**
	 * 构造函数
	 * @param array $config SMTP 配置
	 */
	function __construct($config)
	{
		$this->config = $config;
	}

	/**
	 * 发送邮件
	 * @param string $to_user 收件人邮箱
	 * @param string $subject 邮件主题
	 * @param string $content 邮件内容
	 * @return bool 发送结果
	 */
	public function send($to_user,$subject,$content)
	{
		$type = $this->config['html'] ? 'Content-type: text/html;' : 'Content-type: text/plain;';

	    $cmd = [
	    	"EHLO {$this->config['smtp_name']}\r\n",
	    	"AUTH LOGIN\r\n",
	    	base64_encode($this->config['smtp_user'])."\r\n",
	    	base64_encode($this->config['smtp_pass'])."\r\n",
	    	"MAIL FROM: <{$this->config['smtp_user']}>\r\n",
	    	"RCPT TO: <{$to_user}>\r\n",
	    	"DATA\r\n",
	    	"From: \"{$this->config['smtp_name']}\"<{$this->config['smtp_user']}>\r\n",
	    	"To: <{$to_user}>\r\n",
	    	"Subject:{$subject}\r\n",
	    	$type."\r\n",
	    	"\r\n",
	    	$content." \r\n",
	    	".\r\n",
	    	"QUIT\r\n",
	    ];

	    $this->connect($cmd);

	    return true;
	}

	/**
	 * 连接 SMTP 服务器并发送命令
	 * @param array $cmd SMTP 命令列表
	 */
	protected function connect($cmd)
	{
	    $fp = @pfsockopen($this->config['smtp_host'], $this->config['smtp_port']);
	    $fp or die("Error: Cannot conect to ".$smtp_host);

	    foreach ($cmd as $k => $v) {
	    	@fputs($fp, $v );

	    	$res= fgets($fp);
	    	echo "\n {$v} {$res} \n";

	    	usleep(500000);
	    }
	}
}