验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php( M3 }; o" _! `/ v& ^/ p5 d
session_start();
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// 丢弃输出缓冲区的内容 **
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ob_clean();2 a y2 J- U o! E/ M) ^
header ('Content-Type: image/png');8 m: ~1 s! L: o& I; I. }; _3 \
// 1 创建画布
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$image=imagecreatetruecolor(100, 30);0 {- W; C2 X- C( a5 q% t) R
// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);$ Q9 [& F F9 b' ?/ t
imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){
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// $font=6;
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// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);
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// $string=rand(0, 9);, `) H- ]: o5 u/ n5 u
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);
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// }$ D% q1 p- C' D
$code='';6 G, C0 b" Z- v
for($i=0;$i<4;$i++){
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$fontSize=8;
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$x=rand(5,10)+$i*100/4;) q* O: Q6 @9 m# x7 R$ k. _! ]
$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);+ M( k. l* c# @" w1 v' `( A7 \" E4 c
$code.=$string;
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// 3.2 加载自定义字体
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$font_file = '1.ttf';% q, U0 z0 e; n8 q# d
$color=imagecolorallocate($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, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);
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}
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){: n% @+ I8 B, q2 R7 x9 `
$pointColor=imagecolorallocate($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++){' j) d: O9 _- [ A4 Z2 x
$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));+ [0 t6 x( P R% Q; I: N
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);5 }! u6 z" R3 s; N9 V
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imagepng($image);5 d& r8 t1 U# ^" ?" G
imagedestroy($image);. e/ j$ R$ t+ S; B* t+ I, K6 b
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){! j% b. X! J. I1 m) _) v4 z
session_start();% h' f- L! N$ R7 {! [, [) S* M2 D6 q
if($_REQUEST['code']==$_SESSION['code']){6 b9 S2 t2 F) N( m
echo "<font color='red'>输入正确</font>";: M% V& ^6 U& i9 M5 Y
}else{
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echo "<font color='red'>输入错误</font>";; ~. y- h9 Z- [/ l; a. Q
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?>% _# q0 C& n' u
<!DOCTYPE html>' l6 g! W. j) h+ t( C# i) P
<html>
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<head>2 @, ~0 Z. `8 g9 `/ ~6 f
<meta chartset="UTF-8" />$ y% y! }4 I' L0 Y5 R. o+ I$ v
<style type="text/css" rel="stylesheet">+ q& ]& x: e G2 v- H
a{
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text-decoration:none;( U" Q' U2 M+ b& z+ j' F
font-size:30px;0 c4 l& m. x7 `7 P( y
color:blue;
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a:hover{
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text-decoration:underline;1 A- p9 i1 e: G- t% K0 n! Z
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</style>
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</head>- I0 z( s$ l/ u4 p0 Q5 M
<body>4 }9 Y6 T) }7 w* n# U
<form action="form.php" method="get">% O. ^9 c! A" G H: k) q* _
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>1 I, N. [2 @+ Z7 {* P f8 ~ f
<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 />5 A: v# x$ [: E' x$ {1 J* [ [
<input type="submit" value="提交" />+ }7 K8 W% k8 |5 W8 k' c5 L* z
</form>$ w* O& `+ K# y" o0 l, L5 d
</body>
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<script type="text/javascript">
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function changeCode(){' `& N% j7 }# ?' J
var img=document.getElementById('img');$ p& B# j: c W k8 ?+ x6 b
//img.src='index.php?r='+Math.random();3 q8 R4 Z0 Z# v7 {
img.setAttribute('src','index.php?r='+Math.random());
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</script>0 p1 ~/ Y) K7 i2 l: U, Y. P
</html>

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