PHP

Separates the construction of a complex object from its representation. different representations can be created using the same construction process. Copy codeThe code is as follows: /** * Builder mode * * Separates the construction of a complex

Dynamically add some additional responsibilities to an object, which is more flexible in terms of the extension function than the subclass generation method. Copy codeThe code is as follows: /** * Decoration mode * * Dynamically add some additional

Provide a proxy for other objects to control the access proxy of this object. This means that one role represents another role to take action, just like a red wine vendor in life, instead of directly selling wine retail customers, they all use

Combine objects into a tree structure to represent part-the overall hierarchy, so that the customer's use of a single object and composite object is consistent Copy codeThe code is as follows: /** * Combination mode * * The object is combined into

Defines an interface for creating objects, so that the subclass determines which class to instantiate and delays the instantiation of a class to its subclass. Copy codeThe code is as follows: /** * Factory method mode * * Defines an interface for

Separate the abstract part from its implementation part, and use them to have independent changes Copy codeThe code is as follows: /** * Bridging mode * * Separate the abstract part from its implementation part, and use them to have independent

Defines a one-to-many dependency between objects so that when the status of an object changes, all objects dependent on it are notified and automatically refreshed to conveniently create objects that view the status of the target object, and provide

You can use the meta technology to effectively support a large number of fine-grained objects. For more information, see. The "Flyweight Pattern" is an English term. I am very grateful to the man who translated the "Flyweight Pattern" into the

Use a prototype instance to specify the type of the object to be created, and copy the prototype to create a new object. Copy codeThe code is as follows: /** * Prototype * * Use a prototype instance to specify the object type and copy the

The default session storage method is not suitable for websites with large traffic volumes. Currently, the optimal method is to access sessions using databases. At this time, the function bool session_set_save_handler (callback open, callback close,

Sometimes we need to add external links, but it is not good for a website to have too many external links, so we can achieve this through navigation. URL jump code 1. Code: For example, if you save it as aaa. php, you can implement aaa. php? Url

By investing a lot of energy, attackers try to obtain valid session IDs of existing users. with session IDs, they may be able to have the same capabilities as this users in the system. therefore, our main solution is to verify the validity of the

Php can be used not only in the web environment, but also in a very good shell. the following code demonstrates how to use php to merge images in the shell. Copy codeThe code is as follows: #! /Usr/local/bin/php-q Author: freemouse // The

Given integer: A1A2A3A4... An, where there may be negative numbers. calculate the maximum value of the sum of Ai-Aj. Copy codeThe code is as follows: // Author: distant expectations // QQ: 15624575 // Algorithm analysis: 1. it must be an integer

Websites often need to query the website's whois information. here we will introduce a whoisapi interface created using php. the method is also very simple. The following describes in detail. Here we get data from the data interface of HiChina or

In fact, the operations on arrays in any computer language are a learning, and PHP is no exception. Next I want to introduce 10 tips and related functions for array operations in PHP. 1. add elements to array Php is a weak language. Therefore, you

The thumbnail generation function in php is very simple. it only calls several GD system functions, but it is very useful for array getimagesize (string $ filename [, array & $ imageinfo]) to get the image size. Resource imagecreatetruecolor (int $

A function for randomly displaying images. images stored in a specified folder can be displayed randomly. Copy codeThe code is as follows: /*************************************** ******* * Filename: img. php * Author: freemouse * Web:

PHP and Memcached are already well known standard. It seems too much "? M ", but some details are not clear to everyone: memcache, for example, PECL, has two Memcached modules, Memcache and Memcached, currently, most PHP environments use the

This section describes the functions of session_unset () and session_destroy. For more information about php learning, see. Session_unset () Releases all the $ _ SESSION variables that have been created in the memory, but does not delete the