php 5 introduction.pdf
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PHP 5 Introduction
PHP scripts are executed on the server.
What You Should Already Know
Before you cont inue you should have a basic understanding of the following:
HTMLCSS
JavaScript
If you want to study these subjects first, find the tutorials on our Home page.
What is PHP?
PHP is an acronym for "PHP Hypertext Preprocessor"PHP is a widely-used, open source scriptinglanguage
PHP scripts are executed on the server
PHP costs nothing, it is free to download and use
PHP is an amazing and popular language!
It is powerful enough to be at the c ore of the biggest blogging system on the web (WordPress)!
It is deep enough to run the largestsocial network (Facebook)!It is also easy enough to be a beginner's firstserver side language!
What is a PHP File?
PHP files can contain text, HTML, CSS, JavaScript, and PHP codePHP code are executed on the server, and the result is returned to the browser as plain HTML
PHP files have extension ".php"
What Can PHP Do?
PHP can generate dynamic page contentPHP can create, open, read, write, delete, and close files on the server
PHP can collect form dataPHP can send and receive cookies
PHP can add, delete, modify data in your databasePHP can restrict users to access some pages on your website
PHP can encrypt data
With PHP you are not limited to output HTML. You can output images, PDF files, and even Flash movies. You can also
output any text, such as XHTML and XML.
Why PHP?
PHP runs on various platforms (Windows, Linux, Unix, Mac OS X, etc.)PHP is compatible with almost all servers used today (Apache, IIS, et c.)
PHP supports a wide range of databasesPHP is free. Download it from the official PHP resource: www.php.net
PHP is easy to learn and runs efficiently on t he server side
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