Understanding server erros

We are using internet daily and we got may types of errors but do you know the meaning of that error codes ?

Today I list the error codes with full descriptions and also I will show you whay these errors comes.

400 Bad File Request Usually means the syntax used in the URL is incorrect (e.g., uppercase letter should be lowercase letter; wrong punctuation marks).

401 Unauthorized Server is looking for some encryption key from the client and is not getting it. Also, wrong password may have been entered. Try it again, paying close attention to case sensitivity.

403 Forbidden/Access Denied Similar to 401; special permission needed to access the site — a password and/or username if it is a registration issue. Other times you may not have the proper permissions set up on the server or the site’s administrator just doesn’t want you to be able to access the site.

404 File Not Found Server cannot find the file you requested. File has either been moved or deleted, or you entered the wrong URL or document name. Look at the URL. If a word looks misspelled, then correct it and try it again. If that doesn’t work backtrack by deleting information between each backslash, until you come to a page on that site that isn’t a 404. From there you may be able to find the page you’re looking for.for maore details click here

408 Request Timeout Client stopped the request before the server finished retrieving it. A user will either hit the stop button, close the browser, or click on a link before the page loads. Usually occurs when servers are slow or file sizes are large.

500 Internal Error Couldn’t retrieve the HTML document because of server-configuration problems. Contact site administrator.

501 Not Implemented Web server doesn’t support a requested feature.

502 Service Temporarily Overloaded Server congestion; too many connections; high traffic. Keep trying until the page loads.

503 Service Unavailable Server busy, site may have moved ,or you lost your dial-up Internet connection.

Connection Refused by Host Either you do not have permission to access the site or your password is incorrect.

File Contains No Data Page is there but is not showing anything. Error occurs in the document. Attributed to bad table formatting, or stripped header information.

Bad File Request Browser may not support the form or other coding you’re trying to access.

Failed DNS Lookup The Domain Name Server can’t translate your domain request into a valid Internet address. Server may be busy or down, or incorrect URL was entered.

Host Unavailable Host server down. Hit reload or go to the site later.

Unable to Locate Host Host server is down, Internet connection is lost, or URL typed incorrectly.

Network Connection Refused by the Server The Web server is busy.

Send mail from your localhost

When you developing your site then you are facing a problem that how to send mail from your local host ?


Because when you are testing your project/site in localhost then this problem occurred. At that time you think about upload your site on server.


If you don’t want this type of uploading work and you want to test your mail form your localhost then here is the solution.



First of all open your xamp or wamp installed directory.
Then open php directory and find php.ini.


Then open this php.ini in notepad and find [mail function] in that file.


When you find it, remove semi colon before SMTP,smtp_port and sendmail_from.


Set this parameters like this :


SMTP=mail.test.com  //it indicates mail server


smtp_port=25            // it indicates port address


sendmail_from=test@test.com   // it indicates mail id from which you want to send mail


After this, please stop you xamp/wamp services, do refresh and start it again.


Thats it.. Now you can send mail from your localhost..


If you have any query or any confusion then feel free to comment me.


Thanks !!

Most Common Mistakes When Using a PHP Framework

Mistakes are possible in any type of programming, but PHP frameworks help to limit these mistakes greatly by providing good quality code that is tried and true from the start of the development process. Repetitive coding seems to promote mistakes now and then, and frameworks all but eliminate that problem.

That being said, there are still things to be careful of when utilizing any PHP framework. For instance, unless you are an expert in PHP programming, you should always opt for using a popular framework with plenty of support and an active user base (see below for examples of popular PHP frameworks). There are many frameworks out there that have little or no support, and/or they were created by individuals with limited knowledge of PHP. These types of frameworks can cause your applications to not function properly, and worse case scenario, could cause catastrophic security issues with your website.

Another somewhat common mistake is not ensuring your database and web server is compatible with the particular framework. For example, Seagull PHP Framework recommends the following configuration:

• PHP: PHP 4.3.0 is the minimum, later versions work fine, as do versions PHP 5.1.1 and above. Avoid anything in the 5.0.x series
• MySQL: MySQL 4.0.x, 4.1.x and 5.0.x are all supported. You can also use 3.23.x.
• Apache: Seagull works fine with 1.3.x and 2.x series of Apache

If you don’t meet these requirements, you won’t be observing the best performance possible from your chosen framework. Even if you are an expert in PHP, you should always go over the documentation of the framework to confirm compatibility before trying it out.

Similar to the previously mentioned common mistake, not following the recommended installation process of your PHP framework can also give you some headaches. Take Seagull as an example again – the Seagull wiki has a detailed rundown of the framework’s installation process that has several key steps that are sometimes easily overlooked by careless or unsuspecting developers. The key is to take your time setting up the framework and follow the installation instructions to the “T” – The time you’ll save actually developing applications later will more than make up for the few extra minutes spent installing the framework correctly the first time.

What to Look for in a PHP Framework?

There’s plenty of options available to anyone who may be searching for PHP frameworks, and there’s even the option of creating your own, although that’s only recommended for PHP experts. When searching for the the PHP framework best suited for your needs, it’s important to keep in mind who will be using and/or modifying your applications from top to bottom. If there are many people who will be using the application, it may be best use a popular PHP framework that many developers are familiar with. On the other hand, if you wish to build web applications for your own personal use, you are better off choosing any PHP framework that you’re comfortable with – whether it’s popular amongst the developer community or not.

Various factors to search for in a PHP framework include: easy of use, rapid development/performance, popularity amongst other developers, strong features, and support/forums. It’s recommended to try out several PHP frameworks when you’re first starting out in order to find one that suits your needs the best. All frameworks are slightly different and have varying strengths and weaknesses, for instance Zend Framework has been around since V3 and is full of features plus has an extensive support system in place since it has been around for so long. On the contrary, CakePHP is another PHP framework which is younger than Zend Framework and has slightly less of a support system in place (although support for this framework is growing rapidly), but is much more user-friendly and easy to use.

As you can see, each type of PHP framework has its own advantages, so it’s best to use a bit of trial and error to figure out which one will work the best for your needs. Another excellent way of choosing a framework is to consult your colleagues in the development community to see which ones they prefer. Those who have actually used a specific framework will be able to inform you of the ease-of-use, features, support availability, scope of the community surrounding the framework, and possible shortfalls.

When to use a PHP Framework?

This is a common question amongst experienced and beginner developers alike, and there’s really no direct answer to the question. For many beginners, a framework will offer greater simplicity as well stability, so it may be a good idea to use PHP frameworks whenever possible. It will help reduce or eliminate bad coding and speed up the build process.

On the other hand, many experienced PHP programmers see frameworks as tools for “weak” programmers that don’t understand how to write good, clean code. Whether this is true or not is up for debate, but the fact of the matter is that PHP frameworks are a tool that can be used to save time and tighten up one’s coding.

When working on a project with tight deadlines, utilizing a PHP framework is a huge benefit that can greatly speed up the coding process. So if you’re in a time crunch, PHP frameworks can be very beneficial to you. Another instance when PHP frameworks should be a consideration is when you’re working on projects with substantial amounts of monotonous coding, because it will help make the job much less tedious.

What is a PHP Framework?

PHP is the world’s most popular scripting language for many different reasons – flexibility, ease-of-use, among others – but often times coding in PHP, or any language for that matter, can get rather monotonous and repetitive. That’s where a PHP framework can help.

PHP frameworks streamline the the development of web applications written in PHP by providing a basic structure for which to build the web applications. In other words, PHP frameworks help to promote rapid application development (RAD), which saves you time, helps build more stable applications, and reduces the amount of repetitive coding for developers. Frameworks can also help beginners to build more stable apps by ensuring proper database interaction and coding on the presentation layer. This allows you to spend more time creating the actual web application, instead of spending time writing repetitive code.

The general idea behind the workings of a PHP framework is referred to as Model View Controller (MVC). MVC is an architectural pattern in programming that isolates business logic from the UI, allowing one to be modified separately from the other (also known as separation of concerns). With MVC, Model refers to data, View refers to the presentation layer, and Controller to the application or business logic. Basically, MVC breaks up the development process of an application, so you can work on individual elements while others are unaffected. Essentially, this makes coding in PHP faster and less complicated.

Introduction to MySQL

MySQL is the world’s most popular open source database software, with over 100 million copies of its software downloaded or distributed throughout its history. With its superior speed, reliability, and ease of use, MySQL has become the preferred choice for Web, Web 2.0, SaaS, ISV, Telecom companies and forward-thinking corporate IT Managers because it eliminates the major problems associated with downtime, maintenance and administration for modern, online applications.

Introduction to Ajax

Ajax (shorthand for asynchronous JavaScript and XML) is a group of interrelated web development techniques used on the client-side to create interactive web applications. With Ajax, web applications can retrieve data from the server asynchronously in the background without interfering with the display and behavior of the existing page. The use of Ajax techniques has led to an increase in interactive or dynamic interfaces on web pages. Data is usually retrieved using the XMLHttpRequest object. Despite the name, the use of JavaScript and XML is not actually required, nor do the requests need to be asynchronous.

What are the Best PHP Frameworks Available?

Within the past few years as PHP has evolved as the scripting language of choice by most developers, there have been an explosion of PHP frameworks to hit the scene. There is a great debate about what the best PHP frameworks are, because the simple fact is that not every framework is built for everyone. Here’s a quick rundown of five of the best and most popular choices right now:

The Zend Framework

The Zend Framework has a massive following amongst the development community and is focused on web 2.0 style applications. Because of their massive following, extensive support and active user base, Zend is referred to as “The PHP Company”. Zend is one of, if not, the most popular PHP frameworks available today. It has robust features that are built for corporate-level development, and it requires an extensive knowledge of PHP.

CakePHP

CakePHP is a great choice for beginners to advanced PHP developers. It’s based on the same principles that Ruby on Rails is designed around, and it’s heavily focused on rapid development – making it a great framework to be used for rapid application development. Its rapidly growing support system, simplicity, and scalability make CakePHP one of the most popular PHP frameworks available today.

Symfony

Symfony is aimed more at advanced developers who’s main objective is to create enterprise-level applications – most notably Askeet and Yahoo! Bookmarks. This open source PHP framework is full of features and can do it all, but it’s main downfall is that it is a bit slower than other frameworks.

Codelgniter

Codelgniter is well-known for its ease-of-use, performance and speed. Unlike Symfony, this PHP framework is ideal for shared hosting accounts or for when you want a framework with a small footprint. It offers simple solutions, and has an extensive library of video tutorials, forums, a user guide and wiki available for support. Beginners should consider using Codelgniter.

Seagull

Seagull is a well-established PHP framework used for building web, command line and GUI apps. It is an extremely easy to use framework that is ideal for beginners to advanced coders. For beginners, Seagull features a library of sample applications that can be customized to fit your needs, and for experts, Seagull offers a host of options – including best practices, standards, and modular codebase – for building web applications quickly and easily. Seagull has an active developer community and plenty of support documentation in place as well.

Summary

PHP frameworks are a great way for developers of all skill levels to reduce the need for repetitive coding, speed up the development process, and to ensure proper coding when creating web applications. This not only speeds up the development of rich applications, but it also tightens up PHP security by reducing the risk of security holes in your coding.

While some expert PHP coders do not feel the need to use frameworks to develop web apps, they can still be an advantage in situations where rapid development is necessary, such as under tight deadlines. And for beginner to intermediate developers, frameworks can enhance the PHP learning process while promoting good coding practices and reducing bad coding, which is common in PHP due to its “forgiving” nature.

There are many PHP frameworks available today, and thus developers are sure to find a framework that fits there needs in terms of features, support, speed, scalability and more. Some of the top PHP frameworks used by developers today include: The Zend Framework, CakePHP, Symfony, Codelgniter, and Seagull.