01 | create_code.php |
02 | <?php |
03 | session_start(); |
04 | //生成验证码图片 |
05 | header("Content-type: image/png"); |
06 | // 全数字 |
07 | $str = "1,2,3,4,5,6,7,8,9,a,b,c,d,f,g"; //要显示的字符，可自己进行增删 |
08 | $list = explode(",", $str); |
09 | $cmax = count($list) - 1; |
10 | $verifyCode = ''; |
11 | for ( $i=0; $i < 5; $i++ ){ |
12 | $randnum = mt_rand(0, $cmax); |
13 | $verifyCode .= $list[$randnum]; //取出字符，组合成为我们要的验证码字符 |
14 | } |
15 | $_SESSION['code'] = $verifyCode; //将字符放入SESSION中 |
16 | |
17 | $im = imagecreate(58,28); //生成图片 |
18 | $black = imagecolorallocate($im, 0,0,0); //此条及以下三条为设置的颜色 |
19 | $white = imagecolorallocate($im, 255,255,255); |
20 | $gray = imagecolorallocate($im, 200,200,200); |
21 | $red = imagecolorallocate($im, 255, 0, 0); |
22 | imagefill($im,0,0,$white); //给图片填充颜色 |
23 | |
24 | //将验证码绘入图片 |
25 | imagestring($im, 5, 10, 8, $verifyCode, $black); //将验证码写入到图片中 |
26 | |
27 | for($i=0;$i<50;$i++) //加入干扰象素 |
28 | { |
29 | imagesetpixel($im, rand()p , rand()0 , $black); //加入点状干扰素 |
30 | imagesetpixel($im, rand()p , rand()0 , $red); |
31 | imagesetpixel($im, rand()p , rand()0 , $gray); |
32 | //imagearc($im, rand()p, rand()p, 20, 20, 75, 170, $black); //加入弧线状干扰素 |
33 | //imageline($im, rand()p, rand()p, rand()p, rand()p, $red); //加入线条状干扰素 |
34 | } |
35 | imagepng($im); |
36 | imagedestroy($im); |
37 | ?> |
38 | 引用 |
39 | demo.html |
40 | <!-- DOCTYPE html PUBLIC "-//WAPFORUM//DTD XHTML Mobile 1.0//EN" "http://www.wapforum.org/DTD/xhtml-mobile10.dtd" --> |
41 | <html xmlns="http://www.w3.org/1999/xhtml"> |
42 | <head> |
43 | <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> |
44 | <title></title> |
45 | </head> |
46 |
47 | <body> |
48 | <form action="act.php" method="post"> |
49 | <input type="text" name="code" /> |
50 | <img id="code" src="create_code.php" alt="看不清楚，换一张" style="cursor: pointer; vertical-align:middle;" onClick="create_code()"/> |
51 | <!--<button type="button" onClick="create_code()">更换</button>--> |
52 | <button type="submit">提交</button> |
53 | </form> |
54 | <script> |
55 | function create_code(){ |
56 | document.getElementByIdx_x('code').src = 'create_code.php?'+Math.random()*10000; |
57 | } |
58 | </script> |
59 | </body> |
60 | </html> |
61 | //处理，判断是否输入正确 |
62 | act.php |
63 | <?php |
64 | session_start(); |
65 |
66 | if($_POST['code'] == $_SESSION['code']){ |
67 | echo 'ok'; |
68 | }else{ |
69 | echo 'no'; |
70 | } |
71 | ?> |
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