Questions and Answers
What was the primary motivation behind Rasmus Lerdorf's development of PHP?
PHP 6 was released in 2007.
False
What does PHP stand for?
Personal Home Page/Form Interpreter
PHP was initially developed in _______________________ by Rasmus Lerdorf.
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Match the following PHP versions with their corresponding release years:
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What feature was introduced in PHP 5?
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PHP code is executed on the client-side.
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What was the number of users using PHP to enhance their web pages by 1998?
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PHP 5 was released on _______________________.
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How many domains had PHP installed by 2004?
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Study Notes
PHP Overview
- PHP is a server-side scripting language embedded in HTML.
- It's used to manage dynamic content, databases, session tracking, and even build entire e-commerce sites.
Databases
- PHP is integrated with popular databases such as MySQL, PostgreSQL, Oracle, Sybase, Informix, and Microsoft SQL Server.
- PHP supports a large number of major protocols like POP3, IMAP, and LDAP.
Performance
- PHP is fast in its execution, especially when compiled as an Apache module on Unix.
- The MySQL server executes complex queries with huge result sets in record-setting time.
Syntax and Variables
- PHP syntax is C-Like.
- PHP is a loosely-typed language (no need to explicitly create, typecast, or destroy a variable).
- Variables can be declared using the
$symbol (e.g.,$age,$firstName,$totalSalary,$_myValue, etc.). - Strings can be enclosed in single quotes (') or double quotes (") and concatenated using the dot character (
.). - To display a single quote (
') as a string, use the escape character (\).
File Management
- PHP can create, open, read, write, delete, and close files on the server.
Web Development
- PHP can collect form data, send and receive cookies, and add, delete, or modify data in a database.
- PHP can be used to control user access and encrypt data.
- PHP can output various formats like HTML, images, PDF files, and even Flash movies.
Features
- PHP supports a wide range of platforms (Windows, Linux, Unix, Mac OS X, etc.).
- PHP is compatible with almost all servers used today (Apache, IIS, etc.).
- PHP is free and can be downloaded from the official PHP resource (www.php.net).
- PHP is easy to learn and runs efficiently on the server side.
History
- PHP was developed by Rasmus Lerdorf in 1994/1995 as a PERL/CGI script to track visitors on his online resume.
- PHP 2.0 was released in 1997, and PHP 3.0 followed in 1998.
- PHP 4.0 was released in 1999, and PHP 5.0 was released in 2004.
- PHP 6.0 was planned for release in 2007 but was not released.
Key Categories
- Practicality: PHP is the right language for many applications due to its forgiving nature and versatility.
- Power: PHP has native support for over 25 database products and offers improved object-oriented capabilities.
- Emerging Technologies: PHP supports various emerging technologies like PERL-compatible regular expressions, XML, and web services.
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Description
PHP is a server-side scripting language used to manage dynamic content, databases, and session tracking. It's integrated with popular databases like MySQL, PostgreSQL, and Oracle.
