Example of sending email through curl smtp in php

/**
 Function: Send email
 url: http://bbs.it-home.org
*/
header("content-type:text/html;charset=utf-8");
$smtp = array(
"url" => ; "Email SMTP server address",
"port" => "Email SMTP server port", // Generally 25
"username" => "Username",
"password" => "Password",
"from" => "Sending address",
"to" => "Receiving address",
"subject" => "Test the title",
"body" => "Test the content "
);
$CRLF = "rn";
$test = "";
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $smtp['url']);
curl_setopt($curl, CURLOPT_PORT, $smtp['port']);
curl_setopt($curl, CURLOPT_TIMEOUT,10);
function inlineCode($str){
$str = trim($str);
return $str?'=?UTF- 8?B?'.base64_encode($str).'?= ':'';
}
function buildHeader($headers){
$ret = '';
foreach($headers as $k=>$v ){
$ret.=$k.': '.$v."n";
}
return $ret;
}
//
$header = array(
'Return-path'=>'< ;'.$smtp['from'].'>',
'Date'=>date('r'),
'From'=> '<'.$smtp['from']. '>',
'MIME-Version'=>'1.0',
'Subject'=>inlineCode($smtp['subject']),
'To'=>$smtp['to'] ,
'Content-Type'=>'text/html; charset=UTF-8; format=flowed',
'Content-Transfer-Encoding'=>'base64'
);
$data = buildHeader($ header).$CRLF.chunk_split(base64_encode($smtp['body']));
$content = "EHLO ".$smtp["url"].$CRLF; // Hello first
$content .= "AUTH LOGIN".$CRLF.base64_encode($smtp["username"]).$CRLF.base64_encode($smtp["password"]).$CRLF; // Verify login
$content .= "MAIL FROM:" .$smtp["from"].$CRLF; // Sending address
$content .= "RCPT TO:".$smtp["to"].$CRLF; // Receiving address
$content .= " DATA".$CRLF.$data.$CRLF.".".$CRLF; // Send content
$content .= "QUIT".$CRLF; // Exit
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); / / curl receives return data
curl_setopt($curl, CURLOPT_CUSTOMREQUEST, $content);
$test = curl_exec($curl);
var_dump($test);
echo "rn";
var_dump($ content);
// End
curl_close($curl);
?>

It took nearly 6 hours to make the product code compatible with fsockopen and curl; I will study it when I have time. curl's smtp class for simply sending emails.