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$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;$i<4;$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;$i<80;$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;$i<4;$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 } ...

$num=""; for($i=0;$i<4;$i++){

}<🎜> //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;$i<80;$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;$i<4;$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...