How can ı send custom e-mail from an hook ?

[SametALMDR]

Dear All,

I tried to send a custom email using PHPMailer but it doesnt work.I run the following codes and the information name surname etc. comes from an form which is in index page.

add_hook('ClientAreaPage', 1, function($vars) {
$mail = new PHPMailer(true);

if(isset($_POST['contact_ex'])){
    try {
        //Server settings
        $mail->isSMTP();                                            
        $mail->Host       = 'smtp.gmail.com';                    
        $mail->SMTPAuth   = true;                                   
        $mail->Username   = '---';                     
        $mail->Password   = '---';                              
        $mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;         
        $mail->Port       = 587;
        $mail->CharSet  = 'utf-8';
    
        //Recipients
        $mail->setFrom($_POST['email'], $_POST['namesurname']);
        $mail->addAddress('example@hotmail.com', '--');     
        $mail->addReplyTo($_POST['email'], $_POST['namesurname']);
    
        // Content
        $mail->isHTML(true);                                  
        $mail->Subject = 'Subject';
        $mail->Body    = 'Some message';
    
        if($mail->send()){
            $res = '<div class="alert alert-success" role="alert">
                       <h5 class="alert-heading">Well done!</h5>
                       <p class="mb-0">Your contact information has been sended successfully!</p>
                    </div>';
        }else{
            $res = '<div class="alert alert-danger" role="alert">
                       <h5 class="alert-heading">Oops!</h5>
                       <p class="mb-0">Something went wrong.Please contact with us with phone!</p>
                    </div>';
        }
    } catch (Exception $e) {
            $res = '<div class="alert alert-danger" role="alert">
                       <h5 class="alert-heading">Oops!</h5>
                       <p class="mb-0">Something went wrong.Please contact with us with phone!</p>
                    </div>';
    }
}
});

It gives an error about class is not found how can ı create a PHPMailer object.Can you help me @brian! and all of guys ?

Edited November 24, 2019 by SametALMDR

[brian!]

17 hours ago, SametALMDR said:

Can you help me @brian! and all of guys ?

this is more one for Kian - if you search phpmailer and his username, you should find previous example code that he's posted on this topic.