The following code will help to auto post into blogspot using php code.
    <?php session_start();
    $email = “blogger_email@gmail.com”;
    $pass = “password”;
    $blogID= urlencode(“blogger_id”); // like 6304924319904337556

    // Do Not Modify Below Code
    if(!isset($_SESSION['sessionToken'])) {

    $ch = curl_init(“https://www.google.com/accounts/ClientLogin?Email=$email&Passwd=$pass&service=blogger&accountType=GOOGLE”);
    curl_setopt($ch, CURLOPT_POST,1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION ,1);
    curl_setopt($ch, CURLOPT_HEADER,0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER ,1);
    $result = curl_exec($ch);
    $resultArray = curl_getinfo($ch);
    curl_close($ch);
    $arr = explode(“=”,$result);
    $token = $arr[3];
    $_SESSION['sessionToken'] = $token;
    }

    $entry = “<entry xmlns=’http://www.w3.org/2005/Atom’>

    <title type=’text’>Title of blog post </title>

    <content type=’xhtml’>

    This is testing contnetto post in blog post.

    </content>

    </entry>”;

    $len = strlen($entry);

    $headers = array(“Content-type: application/atom+xml”,”Content-Length: {$len}”,”Authorization: GoogleLogin auth={$_SESSION['sessionToken']}”,”$entry”);

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, “https://www.blogger.com/feeds/$blogID/posts/default”);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_TIMEOUT, 4);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_UNRESTRICTED_AUTH, 1);
    curl_setopt($ch, CURLOPT_POST, true);
    $result = curl_exec($ch);
    $ERROR_CODE = curl_getinfo($ch);
    curl_close($ch);

    echo ‘<pre>’;
    print_r($headers);
    var_dump($result);
    print_r($ERROR_CODE);
    exit;

    ?>