harry potter and the deathly h PHP Section 1 Introduction to PHP

What is PHP:

PHP is a scripting language that runs on computers. Its founder is Rasmus Ledolf. The first two PHP versions were developed by this person; Develop PHP The original intention of the language is relatively simple, which is to maintain personal web pages, count traffic, etc. In order to accelerate development and optimization, the author released it on June 8, 1995, which is also open source.

What are the application scenarios of PHP:

PHP is a language with a wide range of applications, especially in the development of network programs. Generally speaking, PHP is mostly executed on the server side. By executing PHP programs, web pages are generated for browsers to read. In addition, it can also be used to develop command line scripts and user-side GUI applications. PHP can be executed on many different servers, operating systems, and platforms, and can also be combined with many database systems. There is no cost to use PHP. Yes, it is completely free. The official organization PHP Group provides complete program source code, allowing users to modify, compile, and expand it for use.

What are the main data types of PHP:

PHP mainly has the following four scalar types:

• integer(integer)
• Floating point type(float)
• Boolean(boolean)
• String (string)

Two composite types:

• array (array)
• Object

Two special types

• NULL
• Resources

What are the commonly used function libraries in PHP:

The power of a language depends on clear and powerful function libraries and class libraries. Built-in diversified functions are one of the main features of PHP , these open-code functions provide various functions, such as file processing, FTP, string processing, etc. The usage of these functions is similar to C language (such as printf), which is one of the reasons why PHP is so popular.

In addition to the built-in functions, PHP also provides many extension function libraries (extensions), such as various databaseconnection functions, data compressionfunctions, graphics processing, etc. Some extension function libraries need to be obtained from PECL (PHP Extension Community Library).

What are the mainstream open source frameworks for PHP:

The official PHP framework is Zend framework. It was developed since 2005 and has entered a mature stage. Although there is still controversy in the industry about the direction of the PHP framework, in actual production the framework The use has been very common.

Other commonly used PHP frameworks include: Yii, CodeIgniter, CakePHP, Symfony, QeePHP/FleaPHP, ThinkPHP, CakePHP, etc. Using these frameworks can make projects faster and simpler to deploy and more agile development efficiency, but in On the other hand, learning to use these frameworks requires additional learning costs.

What are the mainstream versions of PHP:

PHP has developed from 1.0.0 to today's 5.*.*, 6.0 is also under development; and 5.2.10 is no longer maintained and optimized; the current main version It's 5.3.10 and 5.4.0.

Major version reference.

Reference source:

Wikipedia

PHP Manual

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