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index.php
' H# r) K2 S& ?7 Y9 e: q/ G/ B- <?php- Q6 X- u* X+ ~2 S$ a# j F5 _! x
- session_start();4 W+ ? F- e# \6 U
- // 丢弃输出缓冲区的内容 **# g7 K: P9 k/ N
- ob_clean();
; F7 q& g$ B/ I+ H/ Y; x& Q. A - header ('Content-Type: image/png');( h" j ]* Z8 [# f' S$ c! K' S& p
- // 1 创建画布; ~4 a& F. z) p c" {
- $image=imagecreatetruecolor(100, 30);
. `+ @1 W4 b8 [ - // 2 画一个矩形并填充背景颜色为白色/ a8 }, O$ j$ S; D/ f1 B
- $color=imagecolorallocate($image, 255, 255, 255);: j7 s7 p W& f! y
- imagefill($image, 20, 20, $color);) G' Q* G" y# m; R
- // for($i=0;$i<4;$i++){
( B2 s# r$ ~1 x3 A8 o, x" X - // $font=6;+ L+ n: K9 N9 e0 v. L% }9 _
- // $x=rand(5,10)+$i*100/4;
7 u& @) q7 M4 M6 U( [& M% a# _4 {; P# K9 n - // $y=rand(8, 15);/ F/ ^$ z/ K5 S% V
- // $string=rand(0, 9);, g8 \8 w( m# a8 }4 X
- // $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));* |* a: [1 S% j, ^: n% u% b& W
- // imagestring($image, $font, $x, $y, $string, $color);# q- W6 ?; \: {! `- n
- // }/ f |- e0 Y, u& Z) V$ o* ~2 u
- $code='';5 {, b6 }) ]0 d/ e( Y) i
- for($i=0;$i<4;$i++){+ u0 |. Y9 t/ S
- $fontSize=8;! ~9 V6 }6 c" ^
- $x=rand(5,10)+$i*100/4;
9 R/ M- x& }/ l- L# G! X e - $y=rand(5, 15);
+ n2 t+ z" x2 e" E - $data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
, A7 t4 U9 K" U7 h; U$ M0 v - $string=substr($data,rand(0, strlen($data)),1);! {4 Y o R# @1 `4 C
- $code.=$string;8 l$ | [2 c1 G0 H
- // 3.2 加载自定义字体
) v) g" B8 J# f5 T% ~8 W$ [9 e - $font_file = '1.ttf';- }6 {7 m( Z r- K+ K& n4 T
- $color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
; |3 [0 z- T7 B0 ` - // 把文字填充到画布
7 s2 K& I8 g, t/ A" G5 l - //imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);. s4 A1 E0 j6 |4 f
- imagestring($image, $fontSize, $x, $y, $string, $color);4 o' D' S8 E5 k
- }7 I# L; o' t" _' V8 [0 l
- $_SESSION['code']=$code;//存储在session里# f5 P% _5 Y8 ^ K
- for($i=0;$i<200;$i++){$ l" _) a9 k5 r
- $pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));
: v ^ k$ `) y$ C/ p- A7 J3 i- j6 g: N - imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
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- for($i=0;$i<2;$i++){7 O: \3 J( z# F7 ~$ }: z, B8 G
- $linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));
8 B4 Q5 q- A7 N( B8 K - imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);
3 T/ U- A# m) K) j* c4 o - }
$ ?$ [2 z* ~! J* R! M - imagepng($image);
. u% e" Q8 w. t8 m( j N) d - imagedestroy($image);% s& r' P: c0 K! c, S7 A
8 U. Y7 x& R7 q% i- e, ]- ?>
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form.php
: c; h6 h9 K& a8 ~- <?php
6 l" k" q& |2 m$ T - if(isset($_REQUEST['code'])){
+ C: i# }# E. T - session_start();
$ X) p( b/ H" z8 O. k - if($_REQUEST['code']==$_SESSION['code']){
3 I5 S: e" ?- s+ _7 |/ `) ^" g9 b - echo "<font color='red'>输入正确</font>";0 A+ L, b4 k# g8 s( S1 o
- }else{
9 R! |/ o1 Q! N' {7 Q/ d, R5 U - echo "<font color='red'>输入错误</font>";0 m: j; S- `5 {
- }4 q- J9 E% P Z% g
- }) @1 U* E9 P. l2 q
- ?>
- d! w4 b+ D: E2 ^3 l - <!DOCTYPE html>
- i1 ]( P$ d2 ^& \6 @ - <html>
, \& N5 K9 K) G- Y0 `) a$ R$ A - <head>- {+ H7 @: x0 O
- <meta chartset="UTF-8" />
% P- E6 ^* q4 ^5 A' k) z - <style type="text/css" rel="stylesheet">
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- text-decoration:none;
" l: U _. K9 q8 L - font-size:30px;0 y7 N; g7 x/ b5 u
- color:blue;1 w& h e! H5 p/ A5 S: O6 G5 \
- } N( {$ L5 ]7 U% V' c6 G- f8 A
- a:hover{) E% b' i, e% R
- text-decoration:underline;
4 R, l. S& j7 |/ j! H- b% D - }
! x+ @& y9 ?* J& K/ c - </style>
% J0 [5 `" t' V' y% R3 T2 a& ] - </head>( ]1 Z _) e b/ D' n' T
- <body>
9 r6 T- ~2 a# A/ ]- O$ N - <form action="form.php" method="get">" e9 m2 q F+ Y; }3 P0 X4 _/ n
- 验证码: <img id="img" src="index.php?" onclick="changeCode()"/>' D' ~) @$ t) {' O. ]( o
- <a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />
* s2 x" T$ _% N0 I- ]6 t - 请输入验证码: <input name="code" /><br />
8 l9 [, c' S) O! W" G. v/ `- w6 Z e+ I - <input type="submit" value="提交" />, W( S! [ Z+ j& H
- </form>* w. x/ G. B" g
- </body>
2 m% j. z) N5 t - <script type="text/javascript">' I# B2 ^3 N- V2 L/ Z) E- w
- - H- q# p+ ^, p7 B
- function changeCode(){1 O8 ?3 w: o6 r9 O9 U. z
- var img=document.getElementById('img');/ @" u) Z- R4 D
- //img.src='index.php?r='+Math.random();
% s) B5 W1 \3 _ - img.setAttribute('src','index.php?r='+Math.random());0 e- [' `+ v: Y
- }
7 H% ]3 l6 J9 L$ {* I' z8 \ - </script>
$ f" ^ _! l& ?8 B - </html>
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