验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?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();
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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" {
$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色/ a8 }, O$ 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++){
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// $font=6;+ L+ n: K9 N9 e0 v. L% }9 _
// $x=rand(5,10)+$i*100/4;
// $y=rand(8, 15);/ F/ ^$ 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;
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$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($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
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$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));
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// 把文字填充到画布
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//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, $color);4 o' D' S8 E5 k
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$_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));
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));
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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);% s& r' P: c0 K! c, S7 A
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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']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";0 A+ L, b4 k# g8 s( S1 o
}else{
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echo "<font color='red'>输入错误</font>";0 m: j; S- `5 {
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?>
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<!DOCTYPE html>
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<html>
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<head>- {+ H7 @: x0 O
<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">
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text-decoration:none;
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font-size:30px;0 y7 N; g7 x/ b5 u
color:blue;1 w& h e! H5 p/ A5 S: O6 G5 \
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a:hover{) E% b' i, e% R
text-decoration:underline;
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}
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</style>
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</head>( ]1 Z _) e b/ D' n' T
<body>
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<form action="form.php" method="get">" e9 m2 q F+ Y; }3 P0 X4 _/ n
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>' D' ~) @$ t) {' O. ]( o
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />
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请输入验证码: <input name="code" /><br />
<input type="submit" value="提交" />, W( S! [ Z+ j& H
</form>* w. x/ G. B" g
</body>
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<script type="text/javascript">' I# B2 ^3 N- V2 L/ Z) E- w
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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();
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img.setAttribute('src','index.php?r='+Math.random());0 e- [' `+ v: Y
}
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</script>
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</html>

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