PHP INTRODUCTION

PHP started out as a small open source project that evolved as more and more people found out how useful it was. Rasmus Lerdorf unleashed the first version of PHP way back in 1994.

• PHP is a recursive acronym for "PHP: Hypertext Preprocessor". 
• PHP is a server side scripting language that is embedded in HTML. It is used to manage dynamic content, databases, session tracking, even build entire e-commerce sites.
• PHP Syntax is C-Like.
• PHP supports a large number of major protocols such as POP3, IMAP, and LDAP. PHP4 added support for Java and distributed object architectures (COM and CORBA), making n-tier development a possibility for the first time.
• PHP is forgiving: PHP language tries to be as forgiving as possible.
• PHP is pleasingly zippy in its execution, especially when compiled as an Apache module on the Unix side. The MySQL server, once started, executes even very complex queries with huge result sets in record-setting time.  

Common Uses of PHP

PHP performs system functions, i.e. from files on a system it can create, open, read, write, and close them. The other uses of PHP are: 

• PHP can handle forms, i.e. gather data from files, save data to a file, thru email you can send data, return data to the user. 
• You add, delete, modify elements within your database thru PHP.
• Access cookies variables and set cookies.
• Using PHP, you can restrict users to access some pages of your website.
• It can encrypt data. 

Characteristics of PHP

Five important characteristics make PHP's practical nature possible: 

• Simplicity
• Efficiency
• Security
• Flexibility
• Familiarity