Mainly introduces the definition and inheritance usage of PHP classes. The examples analyze the basic definition of classes in PHP and the usage skills of inheritance. Friends who need it can refer to it. I hope this article will be helpful to you. Everyone's php programming helps.

This class library isIt is a detailed analysis and introduction to the registration and automatic loading of PHP classes. For reference, The paths of the classes in step 1 are relative to init .php, not relative to Utils, this is because we require the class through the autoloading function spl_autoload_register in init.php.

Mainly introduces simple examples of PHP initialization objects and destructors. Friends in need can come and refer to it. I hope it will be helpful to everyone. When the operations inside the object are completed, __destruct() is called, and then the memory used by the object is released.

Mainly introduces the usage of class constants in php. The examples analyze the concepts, characteristics and related usage skills of class constants in php. Friends in need can refer to it. Class constants belong to classes Itself does not belong to the object instance and cannot be accessed through the object instance. Subclasses can override the constants in the parent class and call the constants in the parent class through (parent::) .

Before PHP5, if each PHP framework wanted to implement automatic loading of classes, they usually implemented a class or function that traversed the directory and automatically loaded all files that conformed to the agreed rules according to a certain agreement. Of course, the object-oriented support before PHP5 was not very good, and the use of classes was not as frequent as it is now.

Mainly introduces the definition and usage of PHP object-oriented programming classes, and analyzes the definition, instantiation, __set() and __get() specific usage skills of PHP classes in the form of examples. Friends in need can refer to it.

In PHP we can define a class. A class refers to a collection of variables and some functions that use these variables. PHP is a loosely typed language, so overloading by type does not work, nor does overloading by different numbers of parameters. Sometimes it's good to overload constructors in an orientation so that you can create objects in different ways (passing different numbers of arguments). In PHP, this is achieved through classes.

Introducing a php class and method for generating QR codes. It was written by a technician from a foreign friend. Friends in need can study and research by themselves. If friends have better classes and methods, they can Send it to learn and exchange with everyone.

Mainly introduces complete examples of PHP time class, involving PHP operation techniques for obtaining and comparing dates, times, days, etc. It is very simple and practical, and friends in need can refer to it.

Introducing a relatively complete PHP code for WeChat development, is encapsulated into a WeChat interface class, verifies the validity of the server address, Receive the XML data packet that the WeChat server sends a POST request to the developer server, obtain the parameter content in the received message, aggregate data- Get the latest fun pictures. ##

AExpand PHP's built-in exception handling class, In the try code block, you need to use the throw statement to throw an exception object before jumping to the catch code block for execution , and capture and use the object of this exception class in the catch code block. Although the built-in exception handling class Exception provided in PHP already has very good features, in some cases, this class may need to be extended to get more functions.

Introducing a php filtering illegal character class, check parameters and write logs,submitted parameters are illegal, the system will record your this time Operation , SQL injection log, Friends who need it can download it for study reference, I hope it will be helpful to my friends.