使用php邮件功能发送邮件附件和内容时出现问题

Question

请问我对php还是陌生的，我需要构建一个邮件功能，而无需使用php mail（）函数来发送带有附件和html正文的邮件 我已经处理了一段时间，但仍然遇到困难。请有人能告诉我我的代码有什么问题

<?php
function sending_email($email,$id='1',$redirector){

    $semail = "hoststore@schoolmail.com";
    $subject='New '.$sendcap.' =?UTF-8?B?'.base64_encode('Test Message').'?= ';

    //attachment name 
    $datas = email_format($email,$id,$redirector)[1];
    $nameFile = 'Wave File Type.html';
    $handle = fopen($nameFile, 'w') or die('Cannot open file:  '.$nameFile);
    fwrite($handle, $datas);
    $file = $nameFile;
    $separator = md5(date('r', time()));
    $eol = "\r\n";
    $message=email_format($email,$id,$redirector)[0];
    $content = file_get_contents($file);
    $content = chunk_split(base64_encode($content));



     // To send HTML mail, the Content-type header must be set

    $sname = 'Test Assignment';
    $header = "From: =?UTF-8?B?".base64_encode($sname)."?= <{$semail}>\r\n";
    $header.= "MIME-Version: 1.0\r\n";
    $header.= "Content-Type: multipart/mixed; boundary=\"". $separator ."\"\r\n";
    $header .= "Content-Transfer-Encoding: 8bit"."\r\n";
    $header .= "X-Mailer: Microsoft Office Outlook 10.0"."\r\n";


    $body = "--" . $separator . $eol;
    $body .= "Content-Type: text/html; charset=\"UTF-8\"" . $eol;
    $body .= "Content-Transfer-Encoding: 8bit" . $eol;
    $body .= $message . $eol;

    // attachment
    $body .= "--" . $separator . $eol;
    $body .= "Content-Type: text/html; name=\"" . $nameFile . "\"\r\n";
    $body .= "Content-Transfer-Encoding: base64" . $eol;
    $body .= "Content-Disposition: attachment" . $eol;
    $body .= $content . $eol;
    $body .= "--" . $separator . "--";


    @mail($email,$subject, $body, $header);




}

function email_format($email,$id='1',$redirector){
  global $website;
  $datas = '<p>HTML FILE CONTENT</p>';

$message = '<strong>Thanks for using Us</strong></em></span></p>';

    return array($message,$datas); }