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admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();6 ~* [: h4 D# J
// 丢弃输出缓冲区的内容 **
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ob_clean();
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header ('Content-Type: image/png');5 C$ g, q/ L$ @! @: f1 c
// 1 创建画布
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$image=imagecreatetruecolor(100, 30);% I) }. n R0 i9 H F
// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);$ u0 j5 z4 F0 Z$ M( X
imagefill($image, 20, 20, $color);9 U. k# ]7 H, v7 F2 ^
// for($i=0;$i<4;$i++){' C7 H8 I! t6 Z4 R8 S& q* ^
// $font=6;
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// $x=rand(5,10)+$i*100/4;* B# Y) u, P. l
// $y=rand(8, 15);. T4 P3 \. {0 D$ j: U& _9 F1 i
// $string=rand(0, 9);7 ?. q5 z6 V. L1 X
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));) [% v o9 V" w0 c% k: Z7 h4 U
// imagestring($image, $font, $x, $y, $string, $color);
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// }
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$code='';
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for($i=0;$i<4;$i++){. y1 `$ x8 d' c/ ^) V, p: w
$fontSize=8;, j3 H0 U1 G( ^; K/ u
$x=rand(5,10)+$i*100/4;! B. \& L5 \* L% M8 P' ]" ]+ g8 r; R: p
$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';) _/ G. R) S, e0 H+ t
$string=substr($data,rand(0, strlen($data)),1);) J/ H( H T; J0 H9 ~- O
$code.=$string;
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// 3.2 加载自定义字体
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$font_file = '1.ttf';. y4 V+ N/ i1 K( P" ~
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));0 A" g, |; r% K2 P" `% ~
// 把文字填充到画布8 ^* c. ]& ?9 n! W# a* X
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);6 }' e4 q9 z6 R6 f1 v# O
imagestring($image, $fontSize, $x, $y, $string, $color);
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$_SESSION['code']=$code;//存储在session里4 F! y6 i& g: [9 @' j3 u4 k* N
for($i=0;$i<200;$i++){
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$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));
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imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));" S9 a! {" u7 S' ~, T/ H( s1 v! W2 c* B$ n
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);
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}
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imagepng($image);
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imagedestroy($image);( z+ Y) B9 `/ E' H) l/ ^
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){
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session_start();
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if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";
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}else{
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echo "<font color='red'>输入错误</font>";
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}
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?>
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<!DOCTYPE html>
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<html>' E) q4 F0 O& `
<head>
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<meta chartset="UTF-8" />- V- q: u0 {# Q a- ], S( D0 t" D
<style type="text/css" rel="stylesheet"># ~. t) ~7 L& r8 o
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text-decoration:none;6 }' j/ i; ~6 U2 \. Y6 D' h4 u' M
font-size:30px;
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color:blue;3 X! l( G l4 c4 E
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a:hover{, y: E4 o _. q( C4 M7 e
text-decoration:underline;
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}
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</style>1 |" Q% X8 e' {: a
</head>
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<body>
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<form action="form.php" method="get">
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验证码: <img id="img" src="index.php?" onclick="changeCode()"/>- L! E1 e R" {' v: g# p
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />9 R: g7 W( Z% D% J7 R) c8 K
请输入验证码: <input name="code" /><br />
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<input type="submit" value="提交" />
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</form>
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</body>, @; O9 t/ \) M" ~: `- E0 W! _3 o
<script type="text/javascript">
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function changeCode(){3 L1 ]/ u7 W8 M
var img=document.getElementById('img');9 {0 w; t" C7 Q3 u" }
//img.src='index.php?r='+Math.random();7 T. a z9 P, M! j/ F3 L$ E
img.setAttribute('src','index.php?r='+Math.random());
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}
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</script>
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</html>

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