16c03-2.php

来自「介绍PHP5的给类型函数应用」· PHP 代码 · 共 96 行

<?php
// Prepare by setting a timezone, mail() uses this.
date_default_timezone_set('America/New_York');

// A function that takes an array of email addresses, and a message to send.
//  and connects to a SMTP server, also specified, to deliver the content.
function mass_email($emails, $from, $subj, $message, 
        $smtp, $moreheaders = '') {
    // First order of business is to connect to the SMTP server - port 25:
    if (!($sp = stream_socket_client("tcp://{$smtp}:25", $err_num,
            $err_string))) {
        exit("ERROR: Failed to connect - {$err_num} - {$err_string}\n");
    }

    // Read the response, we should be welcomed with a 220 response
    _check_response(fgets($sp), '220');

    // Now, be friendly and say hello .. Note we are using the server
    //  specified name ... If this is run from the command line, this will
    //  not exist and will need set specifically in some other fashion:
    $host = isset($_SERVER['HTTP_HOST']) 
        ? $_SERVER['HTTP_HOST'] : 'example.com';
    fputs($sp, "HELO {$host}\n");

    // And make sure that they claim this was ok (250 response)
    _check_response(fgets($sp), '250');

    // Now we can start looping, sending an email to each ...
    foreach ($emails as $e) {
        // Allow ourselves 10 seconds to complete this one email:
        set_time_limit(20);
        
        // Say who the email is from:
        fputs($sp, "MAIL FROM: {$from}\n");
        _check_response(fgets($sp), '250');
        
        // Now who is the email to:
        fputs($sp, "RCPT TO: {$e}\n");
        // In this case, a 'bad' response is ok.  It means they don't accept
        //  that particular email address as valid, so skip, and move on:
        if (_check_response(fgets($sp), '250', false)) {
            // Ok, we made it this far.  Prepare for the body
            fputs($sp, "DATA\n");
            _check_response(fgets($sp), '354');

            // Send headers, include the 'moreheaders' parameter if provided
            fputs($sp, "To: {$e}\nFrom: {$from}\nSubject: " .
                "{$subj}\n{$moreheaders}\n\n");
                
            // Now we can send the body:
            fputs($sp, $message);
        
            // And our custom footer
            fputs($sp, "\n\n-- Sent to: {$e} by the " .
                "PHP 5 in Practice Mass Mailer\n");

            // Now close the data with a single period on a line:
            fputs($sp, ".\n");
            _check_response(fgets($sp), '250');
        } else {
            // If we got here the recipient was bad. 
            //  So reset our state to start fresh
            fputs($sp, "RSET\n");
            _check_response(fgets($sp), '250');
        }
    }

    // Close the connection, we are done!
    fputs($sp, "QUIT\n");
    fclose($sp);
    
    // Before exiting, reset the time limit to its original value:
    set_time_limit(ini_get('max_execution_time'));
}

// A small utility function that we will use to check the response from the
//  server:  It checks response against the expected response.  If bail is
//  set to true, it was a BAD error and exits out.  Otherwise it just
//  returns false.
function _check_response($response, $expected, $bail = true) {
    // Compare the response to what was expected:
    if (strncmp($response, $expected, strlen($expected)) != 0) {
        // If we were told to bail, do so:
        if ($bail) {
            exit("ERROR: Bad Response\nExpected: {$expected}
Received: {$response}");
        } else {
            // Just return false so this can be handled
            return false;
        }
    }
    
    // If we made it here, return true
    return true;
}
?>