Page not found - Protocols. Port (computer networking) A port is always associated with an IP address of a host and the protocol type of the communication. It completes the destination or origination network address of a message. Ports are identified for each protocol and address combination by 16-bit unsigned numbers, commonly known as the port number. Specific port numbers are commonly reserved to identify specific services. The lowest numbered 1024 port numbers are called the well-known port numbers, and identify the historically most commonly used services. In the client–server model of application architecture, the ports that network clients connect to for service initiation provide a multiplexing service, so that multiple simultaneous communication sessions may be initiated from these ports.
After an initial service request connects to the well-known port number, the port is freed by switching the servicing of the request to a dedicated, connection-specific port number. An example for the use of ports is the Internet mail system. PHP 5 Tutorial. PHP Tutorial. Introduction Up until recently, scripting on the internet was something which very few people even attempted, let alone mastered. Recently though, more and more people have been building their own websites and scripting languages have become more important. Because of this, scripting languages are becomming easier to learn and PHP is one of the easiest and most powerful yet. What Is PHP? PHP stands for Hypertext Preprocessor and is a server-side language.
Why PHP? You may be wondering why you should choose PHP over other languages such as Perl or even why you should learn a scripting language at all. Using scripts on your website allows you to add many new 'interactive' features like feedback forms, guestbooks, message boards, counters and even more advanced features like portal systems, content management, advertising managers etc.
What Do I Need? As mentioned earlier, PHP is a server-side scripting language. Writing PHP Writing PHP on your computer is actually very simple. Declaring PHP. PHP 101: PHP For the Absolute Beginner. [box] For a complete list of Zend Training Courses – PLEASE CLICK HERE ! [/box] This area is intended for everyone new to PHP. It opens with a series of informal, entertaining tutorials written by Vikram Vaswani, founder and CEO of Melonfire.
These tutorials build on a previously-published 5-part series which has now been updated and extended to embrace PHP 5, making parts of it suitable for those of you who already have worked with PHP 4 in the past. If you came here to learn about elementary PHP 4 or basic PHP 5, this is for you. PHP 101 (part 1): “Down the Rabbit Hole” An introduction to PHP’s variables and operators.PHP 101 (part 2): “Calling All Operators” The rest of the PHP operators (there are many), and simple form processing.PHP 101 (part 3): Looping The Loop Basic control structures explained.PHP 101 (part 4): The Food Factor Arrays, PHP array functions, and what it all means. PHP Tutorial. Learn PHP Online. T50.COM - The World's Real Top Sites.
Tutoriel SharePoint. Téléchargez le kit gratuit pour les métiers et l'IT - PPC. Files/docs/HTML5-Reference-Poster.pdf. Robots.txt Tutorial. How to Create Robots.txt Files Use our Robots.txt generator to create a robots.txt file. Analyze Your Robots.txt File Use our Robots.txt analyzer to analyze your robots.txt file today. Google also offers a similar tool inside of Google Webmaster Central, and shows Google crawling errors for your site. Example Robots.txt Format Allow indexing of everything User-agent: * Disallow: or User-agent: * Allow: / Disallow indexing of everything User-agent: * Disallow: / Disawllow indexing of a specific folder User-agent: * Disallow: /folder/ Disallow Googlebot from indexing of a folder, except for allowing the indexing of one file in that folder User-agent: Googlebot Disallow: /folder1/ Allow: /folder1/myfile.html Background Information on Robots.txt Files Robots.txt files inform search engine spiders how to interact with indexing your content.
When you block URLs from being indexed in Google via robots.txt, they may still show those pages as URL only listings in their search results. Crawl Delay.