php如何实现发送邮件

使用php中的mail()函数

mail(to,subject,message,headers,parameters)

出现报错：
Warning: mail(): “sendmail_from” not set in php.ini or custom “From:” header missing in D:\Program Files\Apache Group\Apache2\ht
需要使用smtp发送邮件

QQ邮箱开启SMTP服务
https://jingyan.baidu.com/article/0f5fb099dffe7c6d8334ea31.html
查看QQ邮箱SMTP服务器以及端口
email.class.php定义发送邮件的库：

<?php
class smtp
{/* Public Variables */var $smtp_port; //smtp_port 端口号var $time_out;var $host_name; //服务器主机名var $log_file;var $relay_host; //服务器主机地址var $debug;var $auth; //验证var $user; //服务器用户名var $pass; //服务器密码/* Private Variables */var $sock;/* Constractor 构造方法*/function smtp($relay_host = "", $smtp_port = 25, $auth = false, $user, $pass){$this->debug   = FALSE;$this->smtp_port = $smtp_port;$this->relay_host = $relay_host;$this->time_out  = 30; //is used in fsockopen()#$this->auth    = $auth; //auth$this->user    = $user;$this->pass    = $pass;#$this->host_name = "localhost"; //is used in HELO command// $this->host_name = "smtp.163.com"; //is used in HELO command$this->log_file  = "";$this->sock = FALSE;}/* Main Function */function sendmail($to, $from, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = ""){$header  = "";$mail_from = $this->get_address($this->strip_comment($from));$body   = mb_ereg_replace("(^|(\r\n))(\\.)", "\\1.\\3", $body);$header .= "MIME-Version:1.0\r\n";if ($mailtype == "HTML") { //邮件发送类型//$header .= "Content-Type:text/html\r\n";$header .= 'Content-type: text/html; charset=utf-8' . "\r\n";}$header .= "To: " . $to . "\r\n";if ($cc != "") {$header .= "Cc: " . $cc . "\r\n";}$header .= "From: " . $from . "\r\n";// $header .= "From: $from<".$from.">\r\n";  //这里只显示邮箱地址，不够人性化$header .= "Subject: " . $subject . "\r\n";$header .= $additional_headers;$header .= "Date: " . date("r") . "\r\n";$header .= "X-Mailer:By (PHP/" . phpversion() . ")\r\n";list($msec, $sec) = explode(" ", microtime());$header .= "Message-ID: <" . date("YmdHis", $sec) . "." . ($msec * 1000000) . "." . $mail_from . ">\r\n";$TO = explode(",", $this->strip_comment($to));if ($cc != "") {$TO = array_merge($TO, explode(",", $this->strip_comment($cc))); //合并一个或多个数组}if ($bcc != "") {$TO = array_merge($TO, explode(",", $this->strip_comment($bcc)));}$sent = TRUE;foreach ($TO as $rcpt_to) {$rcpt_to = $this->get_address($rcpt_to);if (!$this->smtp_sockopen($rcpt_to)) {$this->log_write("Error: Cannot send email to " . $rcpt_to . "\n");$sent = FALSE;continue;}if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)) {$this->log_write("E-mail has been sent to <" . $rcpt_to . ">\n");} else {$this->log_write("Error: Cannot send email to <" . $rcpt_to . ">\n");$sent = FALSE;}fclose($this->sock);$this->log_write("Disconnected from remote host\n");}echo "<br>";//echo $header;return $sent;}/* Private Functions */function smtp_send($helo, $from, $to, $header, $body = ""){if (!$this->smtp_putcmd("HELO", $helo)) {return $this->smtp_error("sending HELO command");}#authif ($this->auth) {if (!$this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user))) {return $this->smtp_error("sending HELO command");}if (!$this->smtp_putcmd("", base64_encode($this->pass))) {return $this->smtp_error("sending HELO command");}}#if (!$this->smtp_putcmd("MAIL", "FROM:<" . $from . ">")) {return $this->smtp_error("sending MAIL FROM command");}if (!$this->smtp_putcmd("RCPT", "TO:<" . $to . ">")) {return $this->smtp_error("sending RCPT TO command");}if (!$this->smtp_putcmd("DATA")) {return $this->smtp_error("sending DATA command");}if (!$this->smtp_message($header, $body)) {return $this->smtp_error("sending message");}if (!$this->smtp_eom()) {return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]");}if (!$this->smtp_putcmd("QUIT")) {return $this->smtp_error("sending QUIT command");}return TRUE;}function smtp_sockopen($address){if ($this->relay_host == "") {return $this->smtp_sockopen_mx($address);} else {return $this->smtp_sockopen_relay();}}function smtp_sockopen_relay(){$this->log_write("Trying to " . $this->relay_host . ":" . $this->smtp_port . "\n");$this->sock = @fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out);if (!($this->sock && $this->smtp_ok())) {$this->log_write("Error: Cannot connenct to relay host " . $this->relay_host . "\n");$this->log_write("Error: " . $errstr . " (" . $errno . ")\n");return FALSE;}$this->log_write("Connected to relay host " . $this->relay_host . "\n");return TRUE;;}function smtp_sockopen_mx($address){$domain = ereg_replace("^.+@([^@]+)$", "\\1", $address);if (!@getmxrr($domain, $MXHOSTS)) {$this->log_write("Error: Cannot resolve MX \"" . $domain . "\"\n");return FALSE;}foreach ($MXHOSTS as $host) {$this->log_write("Trying to " . $host . ":" . $this->smtp_port . "\n");$this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out);if (!($this->sock && $this->smtp_ok())) {$this->log_write("Warning: Cannot connect to mx host " . $host . "\n");$this->log_write("Error: " . $errstr . " (" . $errno . ")\n");continue;}$this->log_write("Connected to mx host " . $host . "\n");return TRUE;}$this->log_write("Error: Cannot connect to any mx hosts (" . implode(", ", $MXHOSTS) . ")\n");return FALSE;}function smtp_message($header, $body){fputs($this->sock, $header . "\r\n" . $body);$this->smtp_debug("> " . str_replace("\r\n", "\n" . "> ", $header . "\n> " . $body . "\n> "));return TRUE;}function smtp_eom(){fputs($this->sock, "\r\n.\r\n");$this->smtp_debug(". [EOM]\n");return $this->smtp_ok();}function smtp_ok(){$response = str_replace("\r\n", "", fgets($this->sock, 512));$this->smtp_debug($response . "\n");if (!mb_ereg("^[23]", $response)) {fputs($this->sock, "QUIT\r\n");fgets($this->sock, 512);$this->log_write("Error: Remote host returned \"" . $response . "\"\n");return FALSE;}return TRUE;}function smtp_putcmd($cmd, $arg = ""){if ($arg != "") {if ($cmd == "")$cmd = $arg;else$cmd = $cmd . " " . $arg;}fputs($this->sock, $cmd . "\r\n");$this->smtp_debug("> " . $cmd . "\n");return $this->smtp_ok();}function smtp_error($string){$this->log_write("Error: Error occurred while " . $string . ".\n");return FALSE;}function log_write($message){$this->smtp_debug($message);if ($this->log_file == "") {return TRUE;}$message = date("M d H:i:s ") . get_current_user() . "[" . getmypid() . "]: " . $message;if (!@file_exists($this->log_file) || !($fp = @fopen($this->log_file, "a"))) {$this->smtp_debug("Warning: Cannot open log file \"" . $this->log_file . "\"\n");return FALSE;}flock($fp, LOCK_EX);fputs($fp, $message);fclose($fp);return TRUE;}function strip_comment($address){$comment = "\\([^()]*\\)";while (mb_ereg($comment, $address)) {$address = mb_ereg_replace($comment, "", $address);}return $address;}function get_address($address){$address = mb_ereg_replace("([ \t\r\n])+", "", $address);$address = mb_ereg_replace("^.*<(.+)>.*$", "\\1", $address);return $address;}function smtp_debug($message){if ($this->debug) {echo $message . "<br>";}}function get_attach_type($image_tag) //{$filedata = array();$img_file_con = fopen($image_tag, "r");unset($image_data);while ($tem_buffer = AddSlashes(fread($img_file_con, filesize($image_tag))))$image_data .= $tem_buffer;fclose($img_file_con);$filedata['context'] = $image_data;$filedata['filename'] = basename($image_tag);$extension      = substr($image_tag, strrpos($image_tag, "."), strlen($image_tag) - strrpos($image_tag, "."));switch ($extension) {case ".gif":$filedata['type'] = "image/gif";break;case ".gz":$filedata['type'] = "application/x-gzip";break;case ".htm":$filedata['type'] = "text/html";break;case ".html":$filedata['type'] = "text/html";break;case ".jpg":$filedata['type'] = "image/jpeg";break;case ".tar":$filedata['type'] = "application/x-tar";break;case ".txt":$filedata['type'] = "text/plain";break;case ".zip":$filedata['type'] = "application/zip";break;default:$filedata['type'] = "application/octet-stream";break;}return $filedata;}
}
?>

具体如何实现发送邮件：

<?php
require 'email.class.php';
$mailto='*********@qq.com'; //收件人
$subject="恭喜您开通年费会员成功"; //邮件主题
$body="回复TD退订"; //邮件内容
sendmailto($mailto,$subject,$body);
echo "finish".date('时间：Y年m月d日  H:i');
function sendmailto($mailto, $mailsub, $mailbd)
{//require_once ('email.class.php');//##########################################$smtpserver   = "smtp.163.com"; //SMTP服务器$smtpserverport = 25; //SMTP服务器端口$smtpusermail  = "***********@163.com"; //SMTP服务器的用户邮箱$smtpemailto  = $mailto;$smtpuser    = "*******@163.com"; //SMTP服务器的用户帐号$smtppass    = "**********"; //SMTP服务器的用户密码$mailsubject  = $mailsub; //邮件主题$mailsubject  = "=?UTF-8?B?" . base64_encode($mailsubject) . "?="; //防止乱码$mailbody    = $mailbd; //邮件内容//$mailbody = "=?UTF-8?B?".base64_encode($mailbody)."?="; //防止乱码$mailtype    = "HTML"; //邮件格式（HTML/TXT）,TXT为文本邮件. 139邮箱的短信提醒要设置为HTML才正常##########################################$smtp      = new smtp($smtpserver, $smtpserverport, true, $smtpuser, $smtppass); //这里面的一个true是表示使用身份验证,否则不使用身份验证.$smtp->debug  = TRUE; //是否显示发送的调试信息$smtp->sendmail($smtpemailto, $smtpusermail, $mailsubject, $mailbody, $mailtype);
}
?>

如果出现报错：
Error: Remote host returned “526 Authentication failure[0]”
则代表SMTP服务器信息填写错误
若出现该报错：
535, b’Login Fail. Please enter your authorization code to login
则代表在qq邮箱没有开启授权或是将$smtppass = "**********"; //SMTP服务器的用户密码更改为授权码
https://zhidao.baidu.com/question/237264721.html
https://www.jb51.net/article/146432.htm

看到有人评论说出现了502报错，试着运行确实有该报错。起初我还以为是qq授权码的问题，qq密码更改了好几次，密码改一次授权码就得重新获取。后来改了授权码也没有解决，于是搜索了其他教程成功解决了该502报错。

https://blog.csdn.net/chengjianghao/article/details/103933784参考该博客，跳转链接下载PHP实现发送邮件的完整项目源码。
定义一个新函数

function sendMail($to,$title,$content) {// 这个PHPMailer 就是之前从 Github上下载下来的那个项目require './PHPMailer/PHPMailerAutoload.php';$mail = new PHPMailer;//使用smtp鉴权方式发送邮件$mail->isSMTP();//smtp需要鉴权 这个必须是true$mail->SMTPAuth = true;// qq 邮箱的 smtp服务器地址，这里当然也可以写其他的 smtp服务器地址$mail->Host = 'smtp.qq.com';//smtp登录的账号 这里填入字符串格式的qq号即可$mail->Username = '2839247368@qq.com';// 这个就是之前得到的授权码，一共16位$mail->Password = 'xccemvofmwcvdgjg';$mail->setFrom('2839247368@qq.com', '你的主管');// $to 为收件人的邮箱地址，如果想一次性发送向多个邮箱地址，则只需要将下面这个方法多次调用即可$mail->addAddress($to);// 该邮件的主题$mail->Subject = $title;// 该邮件的正文内容$mail->Body = $content;// 使用 send() 方法发送邮件if(!$mail->send()) {return '发送失败: ' . $mail->ErrorInfo;} else {return "发送成功";}

调用该函数即可

sendMail($to,$title,$content)

成功发送邮件！

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