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for($i=0;$i $num .= rand(0,9);

The code is as follows

代码如下

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代码如下:    /*   网站验证码程序     *   运行环境： PHP5.0.18 下调试通过     *   需要 gd2 图形库支持（PHP.INI中 php_gd2.dll开启）     *   文件名: showimg.php     *   作者：  17php.com     *   Date:   2007.03     */    //随机生成一个4位数的数字验证码     $num="";     for($i=0;$i     $num .= rand(0,9);     }    //4位验证码也可以用rand(1000,9999)直接生成    //将生成的验证码写入session，备验证页面使用     Session_start();     $_SESSION["Checknum"] = $num;    //创建图片，定义颜色值     Header("Content-type: image/PNG");     srand((double)microtime()*1000000);     $im = imagecreate(60,20);     $black = ImageColorAllocate($im, 0,0,0);     $gray = ImageColorAllocate($im, 200,200,200);     imagefill($im,0,0,$gray);     //随机绘制两条虚线，起干扰作用     $style = array($black, $black, $black, $black, $black, $gray, $gray, $gray, $gray, $gray);     imagesetstyle($im, $style);     $y1=rand(0,20);     $y2=rand(0,20);     $y3=rand(0,20);     $y4=rand(0,20);     imageline($im, 0, $y1, 60, $y3, IMG_COLOR_STYLED);     imageline($im, 0, $y2, 60, $y4, IMG_COLOR_STYLED);     //在画布上随机生成大量黑点，起干扰作用;     for($i=0;$i     {    imagesetpixel($im, rand(0,60), rand(0,20), $black);     }     //将四个数字随机显示在画布上,字符的水平间距和位置都按一定波动范围随机生成     $strx=rand(3,8);     for($i=0;$i     $strpos=rand(1,6);     imagestring($im,5,$strx,$strpos, substr($num,$i,1), $black);     $strx+=rand(8,12);     }     ImagePNG($im);     ImageDestroy($im);    ?>

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The code is as follows:
/* Website verification code program
* * Running environment: Passed debugging under PHP5.0.18
* * Requires gd2 graphics library support (php_gd2.dll in PHP.INI is enabled) * File name: showimg.php

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.....

* Author: 17php.com

* * Date: 2007.03
*/

//Randomly generate a 4-digit verification code

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$code=$_POST["passcode"]; if( $code == $_SESSION["Checknum"]){ 验证通过 }else{ 验证码错误 } ...

$num="";

} //4-digit verification code can also be generated directly using rand(1000,9999) //Write the generated verification code into the session for use on the verification page Session_start(); $_SESSION["Checknum"] = $num; //Create a picture and define the color value Header("Content-type: image/PNG"); srand((double)microtime()*1000000); $im = imagecreate(60,20); $black = ImageColorAllocate($im, 0,0,0); $gray = ImageColorAllocate($im, 200,200,200); Imagefill($im,0,0,$gray); //Draw two dotted lines randomly to interfere $style = array($black, $black, $black, $black, $black, $gray, $gray, $gray, $gray, $gray); imagesetstyle($im, $style); $y1=rand(0,20); $y2=rand(0,20); $y3=rand(0,20); $y4=rand(0,20); Imageline($im, 0, $y1, 60, $y3, IMG_COLOR_STYLED); Imageline($im, 0, $y2, 60, $y4, IMG_COLOR_STYLED); // Randomly generate a large number of black dots on the canvas to interfere; for($i=0;$i { imagesetpixel($im, rand(0,60), rand(0,20), $black); } //Display four numbers randomly on the canvas, and the horizontal spacing and position of the characters are randomly generated according to a certain fluctuation range $strx=rand(3,8); for($i=0;$i $strpos=rand(1,6); Imagestring($im,5,$strx,$strpos, substr($num,$i,1), $black); $strx+=rand(8,12); } ImagePNG($im); ImageDestroy($im); ?> How to use: This program can be run directly. After running, you will see a graphical verification code, and a new code will be randomly generated every time it is refreshed. When using this program on a page, you can use the following code: The code is as follows: ..... Please enter the verification code:

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..... This will display the verification code image. When you get to the verification page, use the following code: The code is as follows: ...

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$code=$_POST["passcode"] ; if( $code == $_SESSION["Checknum"]){ Verified }else{ Verification code error } ... http://www.bkjia.com/PHPjc/629690.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/629690.htmlTechArticleShare a better php verification code program for reference by friends in need. The code is as follows Copy the code The code is as follows: ?php /* Website verification code program * Running environment: PHP5.0.18 Downgrade...