Sharing basic knowledge of development: understanding basic knowledge of Php

What is php?

PHP is the abbreviation of Hypertext Preprocessor, and the PHP scripting language is embedded in HTML. PHP syntax is a unique mixture of c, Java, perl and new PHP syntax. The purpose of this language is to allow web developers to quickly write web pages.

What is php?

PHPprogrammer refers to a php programmer

What is the model?

Pattern, that is, pattern. is a way to solve problems. You summarize the method to solve a certain problem, at the theoretical level, this is a model.

What is a framework?

frame, the frame. Some semi-finished applications are a set of components that you can choose to complete your own system. To put it simply, it is the stage of using others well. In addition, it is generally a mature framework and continuously upgraded software.

What is a template?

PHP templates are developed since Perl templates. Templates can improve the structure of the website, can change the appearance of the entire site in a few seconds, abstract programming, no garbage html code, designers do not need to care about all the obfuscated code, run faster, and it is easier to reuse old templates ( normal form and )

Who are the users of CGI?

CommonGatewayInterface CGI (Common Gateway Interface), abbreviation for a standard for information exchange between Web hosts and external computer programs. When writing external programs can be used to execute any programming language supported by a web host operating system.

What is a resource database?

A resource is a special variable that holds a reference to an external resource. Resources are set up and used through specialized functions. See the PHP manual for all these functions and corresponding resource types.

What is a class?

Classes are definitions of objects. It contains information about the object's motion model, including its name, methods, properties, and events. In fact, it is not an object itself because it does not exist in memory. When code runs a reference to a class, a new instance of the class, or object, is created in memory. Although there is only one class, it can create multiple objects of the same type in memory from this class.

What is the function?

Functions provide programmers with a convenience. Usually in a complex program design, the program is always divided into some relatively independent parts based on complete functions, and each part writes a function so that each part is completely independent and has a single task. The program is clear, simple, easy to read, and easy to maintain.

What is object-oriented?

The object-oriented method (Object-OrientedMethod) is a systematic method that applies object-oriented thinking to the software development process to guide development activities. Hereinafter referred to as the OO (object-oriented) method, the concept of an object-based method is used. Objects are composed of data and allowed operation schemes, and have a direct relationship with objective entities, similar to the object properties of each class that defines a set of objects. A way to share properties and operations with every class in an inheritance hierarchy. The so-called object-oriented concept based on objects is centered on objects and uses classes and inheritance mechanism structures to recognize, understand and describe the objective world and design and build corresponding software systems.

What is a session?

Conversation is to explain conversation in Chinese. A session begins when the user enters a website URL and ends with him leaving the site.

What is a socket?

A socket, often called an socket, is used to describe an IP address and port, and is a communication chain that handles it. Applications typically request or respond to network requests through a socket.

What is pecl?

PECL is a warehouse packaging system for PHP extension libraries.

What are variables?

Variables in PHP are associated with the variable name and a dollar sign. Variable names are case-sensitive.

What is a constant?

A constant is a simple identifier (name). As the name suggests, this value can change during script execution (except for so-called magic constants, which are not actually constants). Constants are case-sensitive by default. Constant identifiers are always uppercase by convention.

What are global variables?

A constant is a simple identifier (name). As the name suggests, this value can change during script execution (except for so-called magic constants, which are not actually constants). Constants are case-sensitive by default. Constant identifiers are always uppercase by convention.