All answers are now outdated. Latest versions (as of February 2018) no longer have autoloading, PHPMailer should be initialized as follows:
<?php require("/home/site/libs/PHPMailer-master/src/PHPMailer.php"); require("/home/site/libs/PHPMailer-master/src/SMTP.php"); $mail = new PHPMailer\PHPMailer\PHPMailer(); $mail->IsSMTP(); // 啟用SMTP $mail->SMTPDebug = 1; // 調(diào)試:1 = 錯(cuò)誤和消息,2 = 僅消息 $mail->SMTPAuth = true; // 啟用身份驗(yàn)證 $mail->SMTPSecure = 'ssl'; // 啟用安全傳輸,Gmail要求 $mail->Host = "smtp.gmail.com"; $mail->Port = 465; // 或者587 $mail->IsHTML(true); $mail->Username = "xxxxxx"; $mail->Password = "xxxx"; $mail->SetFrom("xxxxxx@xxxxx.com"); $mail->Subject = "測(cè)試"; $mail->Body = "你好"; $mail->AddAddress("xxxxxx@xxxxx.com"); if(!$mail->Send()) { echo "郵件發(fā)送失?。? . $mail->ErrorInfo; } else { echo "郵件已發(fā)送"; } ?>