Introduction to PHP 5 Programming

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Introduction to PHP 5 Programming | PHP stands for Hypertext PreProcessor, slightly abusing the order of letters in the abbreviation. PHP was formerly known as Personal Home Page, but since those early times PHP has moved on, and has established itself in the world of professional electronic commerce. Its widespread application can be explained with the fact that it is an Open Source Software, i.e. the source code is freely available to everyone, which attracts a huge developer community testing, developing and fixing bugs. The license terms allow you to download the software and use it for free and without too many restrictions. PHP is available as module to popular web servers like Microsoft Internet Information Services (IIS) and the Apache web server1 to name only two.

The central idea of PHP is to embed scripts with the HTML markup of a page. When the page is requested, the web server relies on the PHP virtual machine to execute the code, embed its output instead of the scripts in the page before sending the page back to the client (see listing 1). Similar server-side scripting technologies are Visual Basic Script (VBScript), Active Server Pages (ASP) or Java Server Pages (JSP). In contrast, scripting technologies such (PERL) of Java Servlets require to use write statements to print HTML markup (see listing 2). Both kinds of technology are currently in use. Novice web programmers often dislike scripting code and hence prefer the embedded scripts way, i.e. “code in markup” over “markup in code”. Download free Introduction to PHP 5 Programming.pdf here