因此，当从我的网站上注册的商家订购产品时，我希望我的代码能够更新他们，同时将相同的电子邮件发送到我们公司的电子邮件地址。 当代码发送到我们公司的电子邮件地址时，不会发送给商家的邮件。 你能告诉我哪里可能是错的吗？谢谢。
请注意，电子邮件变量属于商家，主要是 Gmail 帐户。这可能是 gmail 的限制还是什么？
function mail_merchants_and_shoply($cart_code){
$conn = $this -> connection;
$merchant_sent = false;
$shoply_sent = false;
$query = mysqli_query($conn, "SELECT * FROM business_account ORDER BY business_id DESC")or die(mysqli_error($conn));
while($row = mysqli_fetch_array($query)){
$id = $row['business_id'];
$stat = "NEW";
$email = $row['email_add'];
$name = $row['business_name'];
$c_query = mysqli_query($conn, "SELECT * FROM cart_db WHERE business_id = '$id' AND cart_code = '".mysqli_real_escape_string($conn, $cart_code)."'")or die(mysqli_error($conn));
$merchant_mail_body = "<h2>NEW ORDER</h2><ul>";
while($arr = mysqli_fetch_array($c_query)){
$p_id = $arr['product_id'];
$p_query = mysqli_query($conn, "SELECT * FROM products WHERE product_id = '$p_id'")or die(mysqli_error($conn));
$p_arr = mysqli_fetch_array($p_query);
$image = $p_arr['product_image1_url'];
$price = $p_arr['product_price'];
$name = $p_arr['product_name'];
$image = "<img src = 'https://www.shoply.ng/backend/$image' style = 'max-width: 200px; max-height: 200px'/>";
$merchant_mail_body.="<li>$name</li> <li>$image</li> <li> $price</li>";
}
$merchant_mail_body .="</ul>";
$mail_subject = "NEW SHOPLY ORDER";
// $mailHead = implode("\r\n", ["MIME-Version:1.0","Content-type:text/html; charset =utf-8"]);
$mailHead = "MIME-Version: 1.0" . "\r\n";
$mailHead .= "Content-type:text/html;charset=UTF-8" . "\r\n";
// Additional headers
$mailHead .= 'From: Shoply<orders@shoply.ng>' . "\r\n";
if(mail($email, $mail_subject, $merchant_mail_body, $mailHead)){
$merchant_sent = true;
}
$s_query = mysqli_query($conn, "SELECT * FROM cart_db WHERE cart_code = '".mysqli_real_escape_string($conn, $cart_code)."'")or die(mysqli_error($conn));
$o_query = mysqli_query($conn, "SELECT * FROM orders WHERE order_code = '".mysqli_real_escape_string($conn, $cart_code)."'")or die(mysqli_error($conn));
$o_arr = mysqli_fetch_array($o_query);
$location = $o_arr['delivery_location'];
$phone = $o_arr['delivery_phone'];
$user_fname = $_SESSION['user_fname'];
$shoply_mail_body = "<h2>NEW ORDER</h2> FROM: $user_fname <ul>
<li><b>Address:</b> $location</li>
<li><b>Phone Number: </b>$phone</li>";
// $f_arr = mysqli_fetch_array($s_query);
// $customer_id = $f_arr['customer_id'];
// $c_query = mysqli_query($conn, "SELECT * FROM customers WHERE customer_id= '$customer_id'")or die(mysqli_error($conn));
// $c_arr[]
while($row = mysqli_fetch_array($s_query)){
$p_id = $row['product_id'];
$p_query = mysqli_query($conn, "SELECT * FROM products WHERE product_id = '$p_id'")or die(mysqli_error($conn));
$p_arr = mysqli_fetch_array($p_query);
$image = $p_arr['product_image1_url'];
$price = $p_arr['product_price'];
$name = $p_arr['product_name'];
$image = "<img src = 'https://www.shoply.ng/backend/$image' style = 'max-width: 200px; max-height: 200px'/>";
$shoply_mail_body.="<li>$name</li> <li>$image</li> <li> $price</li>";
}
$shoply_mail_body .="</ul>";
$email = "sales@shoply.ng";
$mail_subject = "NEW SHOPLY ORDER";
// $mail_head = implode("\r\n", ["MIME-Version:1.0","Content-type:text/html; charset =utf-8"]);
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";
// Additional headers
$headers .= 'From: Shoply<orders@shoply.ng>' . "\r\n";
if(mail($email, $mail_subject, $shoply_mail_body, $headers)){
$shoply_sent = true;
}
if($merchant_sent && $shoply_sent){
return true;
}else{
return false;
}
}
} 
我建议使用 php mailter 而不是内置的邮件功能。
PHP 的 mail() 函数使用服务器的基本邮件服务器，在共享主机上，这些服务器通常具有糟糕的电子邮件声誉，因此被许多收件人服务器阻止。 PHP Mailer 允许您直接与任何外部网络服务器通信，如果您想发送电子邮件，甚至可以通过 Gmail 进行通信。
https://github.com/PHPMailer/PHPMailer