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Header ("Content-Type: image/PNG ");// Define the header and declare the image file, preferably PNG, without copyright concerns;$ Authnum = "";// Define the number to be displayed to generate a new four-digit integer Verification Code$ STR =

PHP development framework YiiFramework tutorial (21) UI component custom Captcha example The Yii built-in Captcha can basically meet most of the requirements. if you have special requirements on the verification code, you can customize Captcha. It

This paper introduces a high security verification generator, which can take interference lines and other content, which can effectively prevent users from using the program to identify the difficulty of verification code. The code is as

hands on one's head:Public classsuijishu{Private Static Final intN = 200; Private Static Final intLeft = 40; Private Static Final intright = 10000; Private Static Longx0 = 1L; Private LongA = 1103515245L; Private Longc = 12345L; Private Longm = 21474

OneFull "handwritten code implementation" random number generationExample: generating 20 random numbers in a range 0~10001 Packagegenerate random numbers;2 Public classSuiji {3 Private Static Final intN = 20;//number of random numbers

Look first. The path to the font and font files needs to be set in $fontfilepath and $fontfilename in the class. Such as:Copy the Code code as follows:private static $FontFilePath = "static/font/"; Location relative to this code fileprivate

Framework session Verification Code PHP Public Function myses () {Import ("ORG. Util.date ");$Setime =session (' time ');$Date =new Date;if ($Setime!=null) {$diff = $Date->datediff ("$Setime", "s");if ($diff >=10) {//Determine if expired$Setime

Generate verification Image 1. Image Generation class Public class encryptimage { Public String srand = ""; Public color getrandcolor (int fc, int BC) {// obtain a random color from a given rangeRandom random = new random ();If (FC> 255)Fc = 255;If (

Priority_queue calls make_heap (), pop_heap (), and push_heap () in STL to implement the algorithm. This is another form of heap. First, write a priority_queue which is implemented using the heap Algorithm in STL and similar to the priority_queue

Problem description: 0 ~ An ordered list of M random integers in the n-1 range, which cannot be repeated. m Given that the value of N may be large, the random number that can be returned by the random number generator provided by C/C ++ is usually [

Color getrandcolor (int fc, int BC) {// obtain a random color from a given rangeRandom random = new random ();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 B = FC + random.

Publicfunctionmyses () {import (& quot; ORG. util. date & quot;); $ Setimesession (& #39; time & #39;); $ DatenewDate; if ($ Setime! NULL) {$ diff $ Date-& gt; dateDiff (& quot; $ Setime & quot;, & quot; s & quot;); if ($ diff & gt; 10) {determine

PHP//set session, must be at the top of the scriptsession_start (); $image= Imagecreatetruecolor ( -, -);//1> function to set captcha picture size//set the captcha color imagecolorallocate (int im, int red, int green, int blue);$bgcolor =

Php generates a verification code program with interference. This section describes a verification generation program with high security. it can contain interference lines and other content, which can effectively prevent users from using the program

PHP English Verification Code captcha.class.php Copy the Code code as follows: Class Captcha{Private $width;Private $height;Private $codeNum;Private $code;Private $im;function __construct ($width =80, $height =20, $codeNum =4){$this->width =

A process is a run-time activity of a program with independent functionality about a data collection. In other words, when the system is scheduling multiple CPUs, a basic unit of the program. The process is not an unfamiliar concept for most

Php simple verification code creation $ Image = imagecreatetruecolor (100, 30 ); $ White = imagecolorallocate ($ images, 255,255, 2 ); $ Red = imagecolorallocate ($ image, 255, 0, 0 ); Imagefill ($ image, 0,

I have discussed this issue in the group before. it is quite interesting. mysql syntax is really fun. they all wanted to use PHP to implement random queries, but retrieving multiple entries seemed to require more than two queries. after reading the

PHP English Verification Codecaptcha.class.php Copy CodeThe code is as follows: Class Captcha { Private $width; Private $height; Private $codeNum; Private $code; Private $im; function __construct ($width =80, $height =20, $codeNum

Java. AWT. image. *, java. util. *, javax. ImageIO. * "%>// Create an image in memoryInt width = 60, Height = 20;Bufferedimage image = new bufferedimage (width, height,Bufferedimage. type_int_rgb ); // Obtain the image ContextGraphics G = image.