PHP

String encryption and decryption should be frequently used in data processing, but MD5 encryption is irreversible. Therefore, you can write an encryption and decryption function by yourself. I read a few different or implementation ideas on the

This article introduces PHP constructor, destructor, and this keyword. if you need this keyword, refer to section 1. what is constructor? Constructor is a special class method. its main function is to complete initialization of new objects.

This article mainly judges the source based on the referfer and jumps to the page to avoid Page access failure. the user experience is poor. for example, I developed a yellow page source code and switched it. Previously set a demo program address:

The judgment variable is null and is used in many occasions. at the same time, you and many new users often make some mistakes, so I sorted out some common PHP methods to judge whether the variables are empty. 1. isset function: determines whether a

This article describes how to use php to open remote files, as well as the usage risks and solutions. PHP has a configuration option named allow_url_fopen, which is valid by default. It allows you to point to many types of resources and process them

This article mainly introduces a simple example of PHP string connection. if you need a simple example, you can refer to it. many times we need to connect several strings to display them. in PHP, use "points" to connect strings, that is, periods in

This article mainly introduces some precautions for deploying the PHP project. if you need to deploy the PHP project, you can refer to some notes when deploying the PHP project, it is easy for beginners to ignore the following points: 1. after

This article mainly shares with you a very useful phpheader downloading function. For more information, see The code is as follows: /** * Send a file * * @ Author: legend (legendsky@hotmail.com) * @ Link: http://www.ugia.cn /? P = 109 * @

This article mainly introduces the use example of Baidu ping method. you can automatically ping the website address to Baidu. for details, refer to how to use this method to automatically ping Baidu, my method is to generate the cache. when the

This article mainly introduces the php autoload mechanism example, the file structure is as follows, two ways to achieve automatic loading, friends can refer to the next 1, user-defined functions 2, spl_autoload_register () The code is as

This article mainly introduces the difference between sprintf and printf functions in php. For more information, see the following example: The code is as follows: $ Num1 = 21;Echo sprintf ("% 0.2f", $ num1 ).""; // Output 21.00$ Num2 =

This article describes how to add a watermark to a page using the GD Library in php. For more information, see The code is as follows: Header ("Content-type: image/png "); $ Conn = MYSQL_connect ("localhost", "root", ""); // connect to the

This article describes a simple php Tutorial on MongoDB operations, including connection, addition, modification, deletion, and query. For more information, see MongoDB. The code is as follows:// Connect to localhost: 27017$ Conn = new Mongo (); /

This article mainly introduces examples of php traversal folders and file lists. you can refer to the following example to write a simple class for PHP directory traversal and file list, and attach the example for use, for more information, see.

This article mainly introduces the example of storing php uploaded images into the database. if you need a friend, you can refer to the pictures uploaded by most people. they save a path to the database, which is indeed fast during insertion, it is

This article mainly introduces the php array definition and use example (php array definition method). If you need a php array definition, refer to this example, this section briefly describes the basic use of arrays. annotations are added in the

I have not determined the file type here, because the png and jpeg images do not show a black background after scaling, and the gif image cannot be used independently .. I checked the information and found a perfect solution, with a detailed

This article mainly introduces a Leaf Image drawing example generated by PHP, hoping to help some friends who use PHP for image programming. Effect: Tip: save it to the PHP file and paste it in the browser to

When talking about the Chinese and English mixed-rank counting and truncation, the first thing you think of is to write an intercept function by yourself, which I mentioned in my previous article, today I will share with you the mb extension of php,

This article mainly introduces php + mysql unlimited classification instances that do not require recursion, with a focus on non-recursion. For more information, see how to implement unlimited classification, recursion is generally the first and