Archive for the ‘Last Topics’ thể loại

Sự kỳ diệu của WordPress

December 9th, 2010

One of the premier web hosting sites is WordPress. WordPress is a company that is dedicated to helping their customers set up professional websites quickly and easily. There are numerous advantages to using WordPress as your web hosting platform. It offers a huge variety of template design options that enable a layperson to construct a professional website in just a few hours. Another benefit is that WordPress is search engine optimized, which means that your website will be prominently displayed in the search engine results. Additionally, WordPress allows you to quickly update your visitors through an RSS feed option.

Since WordPress is relatively easy to use and is very popular, there are thousands of plug-ins that allow you to customize your website design. WordPress is truly magical in allowing people who don’t know programming to design a great website. For example, if there is a specific function that you want your website to carry out, you can download the appropriate plug-in and activate it on your website by going to your WordPress account administration tab. With so many options available to WordPress users, the ability to creatively design a unique website is unparalleled.

For the best web hosting, WordPress is the gold standard. Because of the SEO that is already incorporated into the WordPress platform, the customer’s search engine ranking will be higher than it would be with many other website hosting sites. In order to keep your search engine results at a high ranking level, it is important to frequently update your website with original content. Additionally, when you post a sale or special event on your website, it will be found by the search engines more rapidly and your ranking will increase, so that you are closer to the top of the search engine results. This in turn will generate more traffic to your site and broaden your prospective customer base.

Another great aspect of WordPress is that it has a built-in RSS feed. An RSS feed is an efficient way for your visitors to be regularly updated about your activities. When new content has been added to your site or you have posted a new blog entry, the visitors who subscribe to your RSS feed are immediately notified via e-mail by WordPress. This function will save you a lot of time because the program does the work of updating your visitors for you.

Among the numerous web hosting sites, there are many advantages to using WordPress to design and host your website. The program is very user-friendly and quite customizable to fit your market niche. In addition, WordPress is already search engine optimized, so you will benefit from being highly-ranked in the search engine results. If you want to take a look at some websites that are designed with WordPress, here are a few excellent examples: The Department of Environmental Science at the University of Virginia, Ford Motor Company and Outreach Magazine.

If you are engaged in an online marketing campaign, consider utilizing the magic of WordPress. The platform will enable you to construct a great website with ease. With a professional website that you can update easily, you will be able to stay ahead of the competition and increase your market share

This post is contributed by Kirsten Ramsburg, a senior writer for a web hosting reviews company.

PHP Error Nesting Level Too Deep Recursive Dependency

March 12th, 2010

I’ve installed PHP 5.2 at one of my testing computers today and a couple of bits of code that previously worked fine in version 5.1.6 threw fatal errors in the new version. The error message was “Nesting level too deep – recursive dependency?” and it took a little time

to track down the root of the problem. Here’s what I’d done wrong.

In PHP there are two comparison operators, == and ===. It’s generally known that the first is not strict about type but the second is. Như vậy, for example

echo ( false == 0 ); // true

echo ( false === 0 ); // false

– 0 is an integer and false is a boolean

My problem arose from using non-strict typing with objects.

$a = new MyObj();
$b = new MyObj();
if( $a == $b )

I hadn’t considered what I was doing with this code. When comparing two objects using the non-strict comparison operator (==) PHP compares all the properties of the objects and if they match the objects are deemed to be equal. If they don’t match they are not equal. In effect, we have a recursive comparison of all the properties of each object, and all their properties, etc. until we reach basic data types like strings and integers.

If, however, we use strict comparison (===), PHP will check whether the two objects are exactly the same object, not just objects with the same properties.

class MyObj
{
public $p;
}

$a = new MyObj();
$b = new MyObj();
$c = new MyObj();
$a->p = 1;
$b->p = 1;
$c->p = 2;
echo ( $a == $c ); // false
echo ( $a == $b ); // true
echo ( $a === $b ); // false

The problem arises if you have circular references in your objects properties. Như vậy, for example

class MyObj
{
public $p;
}
class OtherObj
{
public $q;
}

$a = new MyObj();
$b = new OtherObj();
$a->p = $b;
$b->q = $a; // the circular reference: $a->p->q === $a

$c = new MyObj();
$d = new OtherObj();
$c->p = $d;
$d->q = $c;// another circular reference: $c->p->q === $c

echo ( $a == $c ); // Fatal error:
Nesting level too deeprecursive dependency?

In order to compare $a to $c, PHP must compare their properties. So the logic in PHP goes something like this: $a == $c if $a->p == $c->p if $a->p->q == $c->p->q if $a->p->q->p == $c->p->q->p etc. indefinitely.

PHP 5.1 seemed to smooth over the problem somehow (probably after a certain level of recursion it simply returned false) – and usually it worked out fine. PHP 5.2 correctly produces the fatal error above.

Once you know the problem, the solution is easyuse strict comparison.

echo ( $a === $c ); // false (and no error)

The strict comparison will simply check whether the two objects are at the same location in memory and so doesn’t even look at the values of the properties.

N.B. The same problem can arise when using the negated comparison operators (use !== instead of !=) and when using in_array (use in_array’s third parameter to indicate strict comparison).

How to receive and parse emails using POP3 and PHP

March 1st, 2010

I would like to describe some methods on how to write the processor for incoming mail. I had to use such manipulation to parse e-mails received from various sources. This can be useful for writing your own spam filter system, answering machine or ticket system to receive applications by e-mail.

To implement the e-mail parser algorithm we need

  1. connect and log-on to e-mail server
  2. count the number of incoming letters
  3. recive e-mail from the server using POP3 protocol
  4. process the e-mail headers and body and make parsing
  5. implement any additional actions

Ok, there is very specific task for PHP coding, so we need hosting that supports external connection. I do not propose to write decision entirely because much has been realized by talented programmers already. For example, you can take a ready module which will allow accept e-mails from a remote server.

Thank’s to Manuel Lemos and his module (php class) which named pop3.php.

To connect that class to your code, you just need to use include or require command: require(“pop3.php”);


hostname=$hostname;
$result=$pop3_connection->Open();
 
// We are trying to open connection and display the result
echo $result;
// Trying to logon and display the error if any appear
$error=$pop3_connection->Login($user,$accesscode,$apop);
if ($error<>'Password error: Logon failure: unknown user name or bad password.') {echo $error; exit;}
// Now get the statistic how many emails are stored and the size of them $result=$pop3_connection->Statistics($messages, $size);
echo "$hostname contains  $messages of $size bytes.";
 
//..... There we can receive e-mails in the cycle and parse them.... //
 
// If nothing to do - we can close the connection
$error=$pop3_connection->Close(); //
echo $error;
?>

Now we know how to connect and log-on to the POP3 server and how to request the number of Inbox e-mails and them sizes. Next, we should receive each e-mail and parse the headers and body array.

TO BE CONTINUED

Miễn phí MBOX để EML Chuyển đổi

14 Tháng 2, 2010

Nó là tốt mà ngày nay vẫn còn có những lập trình viên, những người viết phần mềm tuyệt vời miễn phí. Những gì tôi đang nói về? Muốn cho bạn biết làm thế nào tôi tìm thấy một chương trình khác cho bộ sưu tập của tôi phải có tiện ích.

Apple MAC máy tính được phổ biến rộng rãi sử dụng trong văn phòng của chúng tôi. Đây là chính sách của công ty. Mặc dù chính sách của công ty, ông chủ của chúng tôi thích Windows và sử dụng máy tính xách tay tính năng của nó. Ai nên phá vỡ các quy tắc? Tất nhiên các ông chủ, the rest is not allowed 🙂 I must say that I share that preference, vì vậy tôi đã cài đặt Windows 7 để máy tính xách tay nhà tôi.

Các luật sư của chúng tôi phải vượt qua một số cuộc điều tra từ thời gian để thời gian và họ nên xem xét sự tương ứng của các nhân viên của chúng tôi nhưng họ chỉ chấp nhận các tập tin trong Định dạng Outlook PST.

Trong một bài viết trước Tôi đã viết về chương trình vô cùng cần thiết Outlook Import Wizard, mà lưu lại cho tôi rất nhiều thời gian khi nhập khẩu các file eml sang Outlook. Các nhiệm vụ mà tôi phải hoàn thành chỉ cần đặt tôi vào sốc. Nó là cần thiết để chuyển đổi e-mail của nhân viên của chúng tôi vào Outlook .pst hồ sơ. Làm thế nào chúng ta có thể dung hòa những điều không phù hợp? Làm thế nào để kết hợp MAC OS với Windows?

For a start I had to conduct an audit and found that our employees using various e-mail clients. There are just some of them: Turnpike, Mac Mail, Entourage, MailCopa, Tên của loài chim, Eudora, Berkeley Mail. The conversion task did not seem doable. I decided that if a search engine does not immediately bring me the solution, then I will say to my Boss that the mission is impossible. So I did search for the phraseentourage, thunderbird, mac mail, to eml to pst free mboxand the search was successful, it proved something I never expected. Moreover, the word FREE does not tally with me with the task that had to do. Imagine my surprise when on the description page of the another one eml to pst converter, I found the free mbox to eml converter.

Việc xem xét lại phần mềm cho thấy, mặc dù thực tế rằng chương trình là miễn phí, nó có tiềm năng đáng kinh ngạc. Tuy nhiên các định dạng tập tin hộp thư của các chương trình khác nhau khác nhau, chương trình đã có thể xác định chính xác tất cả các chữ ký meta và nhận biết đúng định dạng tập tin. Tôi không đùa, tất cả các tập tin hộp thư Turnpike, Mac Mail, Entourage, MailCopa, Tên của loài chim, EudoraBerkeley Mail đã được chuyển đổi thành các mảng của các tập tin e-mail trong Định dạng EML. Có Outlook Import Wizard tại bàn tay của tôi cho phép tôi để nhập khẩu tất cả eml file vào Outlook PST.

Miễn phí MBOX để EML Chuyển đổi hoạt động như một lô-vi xử lý. Trước tiên, bạn nên chọn tất cả cần thiết file mbox mà từ đó bạn muốn tải tin nhắn eml. Nó rất dễ dàng để chọn tất cả các tập tin với các Sự thay đổi chìa khóa. Sau đó, bạn cần nhấp vào Chế biến nút, trỏ đến thư mục trống ở ổ đĩa cứng của bạn và chờ đợi kết quả. Các chương trình xử lý tất cả các tập tin tuần tự, it creates a directory for each file and fill it with extracted eml files. In my case I had a lot of mailbox files that were named in accordance with user-names of our employees. Eventually I got a lot of folders, each had a user name and contained all corresponding eml files retrieved from the mailbox.

Space Shuttle video from start to end

January 25th, 2010

NASA! I found this video absolutely amazing. Twelve minutes of action of Space Shuttle parts. Start from the Earth and down to the sea. Space cameras on each part of shuttle, looks very interesting. Very beautiful Space Shuttle video.

STS-129 video highlights as compiled by the SE&I imagery team here at JSC from all of the ground, air, ET and SRB assets.