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  Today we're going to look at the PHP captcha, we do it with a simple digital captcha, and first write a code to generate the CAPTCHA:   code is as follows &nbs P; //randomly generate a 4-digit number validation

This is a very cool HTML5 canvas animation, it will simulate the reality of our real life fireworks animation effects, the effect is very realistic, but after all, computer simulation, with a girlfriend to see it, the effect is still poor point,

9.5 constraints Sometimes you have to make sure that elements added to the generic list have certain constraints (for example, they inherit from a given base class or that they implement the specified interface). In the example below, we have

Authnum.class.php Download Copy CodeThe code is as follows: Session_Start (); Class Authnum { Picture object, width, height, verification code length Private $im; Private $im _width; Private $im _height; Private $len; Random string, y coordinate

PPT2010 used a period of time, from the installation application to slowly adapt to spend some time, is also groping forward, PPT2010 than the previous version has a great change, improve the efficiency of our office. 　　But PPT2010 itself is not a

Concurrent collections provides thread-safe, well tuned data structures, and simplifies concurrent programming. However, in some cases, developers need to take a step further and think about how to adjust and/or restrict thread execution. Because

This article mainly introduces the pseudo random number and the true random number of PHP, this paper first explained the concept of true random number and pseudo random number, and gave a better pseudo-random number than using Mt_rand () function

Ado New features of Ado.net 2.0 dataset and DataTable 1. Faster execution efficiency of the new indexing engineThe following code takes 157 seconds in 2003 and can be completed in 2005 in 11 seconds: DataSet ds = new DataSet (); Ds. Tables.add

asp.net introduction In the real world, people often want to be able to save some or all of the content of a text file to a Web page variable. In the classic ASP, as long as the simple use of FileSystemObject can be done. In fact, there is a FAQ

In this paper, we describe the method of random exchange of elements in the log group of PHP. Share to everyone for your reference. The specific analysis is as follows: This is a custom PHP array element random swap function, PHP already has a

js| Verification Code | Chinese //Generate random color Color Getrandcolor (Random Random, int FC, int BC) { if (FC > 255) FC = 255; if (BC > 255) BC = 255; int r = FC + Random.nextint (BC-FC); int g = FC + Random.nextint (BC-FC); int

The title is probably like this: given two large arrays (1w or more below 100 million), find the intersection of two arrays in the most efficient way. For this problem, I have a idea is to sort the array first, and then use two pointers in the

First, file permissions In short, everything is to ensure the security of the directory, the security of the directory is more important than to ensure the security of the file. Second, write the document File_put_contents ($file, $data); //If

In the use of PHP to develop Web applications, many applications will require users to register, and registration when we need to user information processing, the most common is the mailbox and password, this article is intended to discuss the

1. Research Notes Tencent in Tqq.tencent.com 8000 has a use of HTTP QQ interface, through this interface, you can do some basic operations, such as: Landing, log out, change the landing status (on-line, busy, offline, stealth), add delete friends,

1, open Excel, a new blank form in A1 write red ball, B1 write blue ball. 2, in A2 write =1+int (rand () *33), enter. 3, move the mouse to the lower right A2, so that the cursor into a black cross. 4, hold down

In real life, grouping statistics is very common. For example, the People's bank requires commercial banks to submit a report on the anti-money laundering of a project is the month of the number of large transactions and the amount of money, where a

One advantage of using multiple threads in an application is that each thread can execute asynchronously. For Windows applications, time-consuming tasks can be performed in the background, allowing application windows and controls to remain

Photo validation is often used in relation to registering and publishing messages. I have written a JSP here, for your reference. Com.sun.image is not a standard package for Java. Additional downloads are required. Related address:

Sometimes we do not want the browser to use caching to speed up the display of the Web page, especially those forums such as frequently updated content of the page, on the internet can be said to use the following methods to screen the cache, but I