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PHP


What Is PHP? PHP stands for Hypertext Preprocessor (no, the acronym doesn't follow the name). It's an open source, server-side, scripting language used for the development of web applications. By scripting language, we mean a program that is script-based (lines of code) written for the automation of tasks. What does open source mean? Think of a car manufacturer making the secret to its design models and technology innovations available to anyone interested. These design and technology details can be redistributed, modified, and adopted without the fear of any legal repercussions. The world today might have developed an amazing supercar! Web pages can be designed using HTML. With HTML, code execution is done on the user's browser (client-side). On the other hand, with PHP server-side scripting language, it's executed on the server before it gets to the web browser of the user. PHP can be embedded in HTML, and it's well suited for web development and the creation of dynamic web pages for web applications, e-commerce applications, and database applications. It's considered a friendly language with abilities to easily connect with MySQL, Oracle, and other databases. PHP Use PHP scripts can be used on most of the well-known operating systems like Linux, Unix, Solaris, Microsoft Windows, MAC OS and many others. It also supports most web servers including Apache and IIS. Using PHP affords web developers the freedom to choose their operating system and web server. In PHP, server-side scripting is the main area of operation. Server-side scripting with PHP involves: PHP Parser: a program that converts source and human readable code into a format easier for the computer to understand Web server: a program that executes files that form web pages from user requests Web browser: an application used to display content on the World Wide Web In this instance, with the use of just a PHP parser, the PHP script can be executed without a server program or browser. This use of the PHP script is normally employed for simple text processing tasks, like task schedulers. PHP can also be used for creating client-side applications, like desktop applications. Desktop applications are usually characterized by a graphic user interface. With knowledge in using the advanced features of PHP, such as PHP-GTK, these client-side applications can be developed. PHP is the most widely used server language on the web. This course will help you get started with the language in no time. We will cover installing a web server, PHP, and the MySQL database server. Then we will process form data and later store everything in a MySQL database. We will take special care about common security-related pitfalls and will avoid common attacks. Finally, we will develop a small sample application which also features authentication and authorization. This course does not provide a complete introduction into the language syntax, so knowledge of any programming language is beneficial but you will be able to pick up the rest! What is PHP? PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML. Instead of lots of commands to output HTML (as seen in C or Perl), PHP pages contain HTML with embedded code that does "something" (in this case, output "Hi, I'm a PHP script!"). The PHP code is enclosed in special start and end processing instructions that allow you to jump into and out of "PHP mode." What distinguishes PHP from something like client-side JavaScript is that the code is executed on the server, generating HTML which is then sent to the client. The client would receive the results of running that script, but would not know what the underlying code was. You can even configure your web server to process all your HTML files with PHP, and then there's really no way that users can tell what you have up your sleeve. The best things in using PHP are that it is extremely simple for a newcomer, but offers many advanced features for a professional programmer. Don't be afraid reading the long list of PHP's features. You can jump in, in a short time, and start writing simple scripts in a few hours. Although PHP's development is focused on server-side scripting, you can do much more with it. Read on, and see more in the What can PHP do? section, or go right to the introductory tutorial if you are only interested in web programming.

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