PHP mail() alternative, smtp()

smtp.php

<?php

/**
 * Send a mail using smtp server
 * 
 * @param       array $options  [from, to, server, tls, subject, message .. etc]
 * @param       array $headers  for custome headers as key value pairs [key is case insensetive]
 * 
 * @author      Mohammed Al Ashaal <fb.com/alash3al, is.gd/alash3al, github.com/alash3al>
 * @copyright   (c) 2015, Mohammed Al Ashaal
 * @version     1.0.0
 * 
 * @return      object
 */
function smtp(array $options = array(), array $headers = array())
{
    // get the error-reporting state
    $e = error_reporting();

    // disable errors [temp]
    error_reporting(0);

    // the options array
    $options    =   array_merge(array(
        'server'    =>  '127.0.0.1',
        'port'      =>  25,
        'domain'    =>  $_SERVER['SERVER_NAME'],
        'user'      =>  '',
        'pass'      =>  '',
        'tls'       =>  false,
        'from'      =>  '',
        'to'        =>  '',
        'subject'   =>  '',
        'message'   =>  ''
    ), $options);

    // the headers array
    $headers    =   array_merge(array
    (
        'to'            =>  '<'.($options['to']).'>',
        'from'          =>  '<'.($options['from']).'>',
        'subject'       =>  $options['subject'],
        'content-type'  =>  'text/html; charset=UTF-8',
        'mime-version'  =>  '1.0',
        'x-mailer'      =>  'PHP/' . phpversion(),
        'x-sender'      =>  $options['from']
    ), array_change_key_case($headers, CASE_LOWER));

    // the commands array
    $cmds = array();

    // initialize the socket client
    $soc = @stream_socket_client($options['server'], $errno, $errstr);

    // return the error string if there is an error
    if ( $errno || !$soc )
        return trim($errstr);

    // fetch the remote info
    $cmds['START']  =   trim(fread($soc, 4096));

    // say hello
    fputs($soc, 'HELO ' . $options['domain'] . PHP_EOL);
    $cmds['HELO']   =   trim(fread($soc, 4096));

    // only send STARTTLS if required
    if ( $options['tls'] )
    {
        fputs($soc, 'STARTTLS' . PHP_EOL);
        $cmds['TLS']    =   trim(fread($soc, 4096));
    }

    // auth. if required
    if ( !empty($options['user']) && !empty($options['pass']) )
    {
        fputs($soc, 'AUTH LOGIN' . PHP_EOL);
        $cmds['LOGIN']  =   trim(fread($soc, 4096));
        $cmds['LOGIN']  =   base64_decode(substr($cmds['LOGIN'], 4));

        fputs($soc, base64_encode($options['user']) . PHP_EOL);
        $cmds['USER']   =   trim(fread($soc, 4096));

        fputs($soc, base64_encode($options['pass']) . PHP_EOL);
        $cmds['PASS']   =   trim(fread($soc, 4096));
    }

    // The From section
    fputs($soc, sprintf('MAIL FROM: <%s>', $options['from']) . PHP_EOL);
    $cmds['FROM']   =   trim(fread($soc, 4096));

    // The To section
    fputs($soc, sprintf('RCPT TO: <%s>', $options['to']) . PHP_EOL);
    $cmds['RCPT']   =   trim(fread($soc, 4096));

    // The Data command
    fputs($soc, 'DATA' . PHP_EOL);
    $cmds['DATA']   =   trim(fread($soc, 4096));

    // the headers + body
    $h  =   '';

    // iterate over the headers array and generate
    // the valid string .
    foreach ( $headers as $k => $v ) {
        $h .= sprintf('%s: %s', str_replace(' ', '-', ucwords(str_replace('-', ' ', $k))), $v) . PHP_EOL;
        unset($headers[$k]);
    }

    // \r\n\r\n
    // message
    // \r\n.\r\n
    $h .=   PHP_EOL . PHP_EOL;
    $h .=   $options['message'] . PHP_EOL; 
    $h .=   '.' . PHP_EOL;

    // send the headers+body
    fputs($soc, $h);
    $cmds['SEND']   =   trim(fread($soc, 4096));

    // request it to exit
    fputs($soc, 'QUIT'  .   PHP_EOL);
    $cmds['QUIT']   =   trim(fread($soc, 4096));

    // close the socket client
    fclose($soc);

    // roll-back the error-state
    error_reporting($e);

    // return an object of status-code + commands log
    return (object) array(
        'status_code'   =>  (intval(substr($cmds['QUIT'], 0, 3)) == 221),
        'log'           =>  &$cmds
    );
}

Example:

    // Example:
    $smtp = smtp
    (
        // The configs/options array
        array
        (
            // the smtp-server to use and its port
            'server'    =>  'ssl://smtp.mail.yahoo.com:465',

            // the server username [if required]
            'user'      =>  'username-here',

            // the server password [if required]
            'pass'      =>  'password-here',

            // the from email address,
            // some mail providers don't support relay
            // means it will deny any from mails
            // except for their mails .
            'from'      =>  '[email protected]',

            // where to send ?
            'to'        =>  '[email protected]',

            // the subject
            'subject'   =>  'just a test',

            // the message
            'message'   =>  '<b>test</b>',

           // tls --> off [default is false]
            'tls'       =>  false,

           // the domain to be used in handshake
           // default:  $_SERVER['SERVER_NAME']
           'domain'    =>  'mydomain.com',
        ),

        // The headers array
        // header-field => header value
        array
        (

            // the from part
            // some mail providers will override the <mail> part
            // for some security reasones
            'from'      =>  'User Name <[email protected]>'
        )
    );

    var_dump($smtp);