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admin · 发表于 2018-12-16 01:00:13

index.php

<?php& y* [0 W( G1 p! k. [9 B. n
session_start();
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// 丢弃输出缓冲区的内容 **
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ob_clean();% b! E' ^8 L* y5 z; k
header ('Content-Type: image/png');( R% a3 C/ ^( k+ K- h
// 1 创建画布
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$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色1 c0 k3 i: o! T* H6 a
$color=imagecolorallocate($image, 255, 255, 255);; o$ {+ Y& D# u0 n$ ?6 E9 I
imagefill($image, 20, 20, $color);2 W9 o+ D$ b) j2 ?% `% Q4 s' ]
// for($i=0;$i<4;$i++){
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// $font=6;( G: J1 w. s" l$ I& H; ` c5 G
// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);/ k6 v: A+ H- V: _9 u! ?/ c4 V
// $string=rand(0, 9);
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// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);' _/ L) C R7 L" F
// }
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$code=''; D6 K) Y" A R9 }3 Y( }
for($i=0;$i<4;$i++){
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$fontSize=8;4 t1 G G0 P& y8 k, j
$x=rand(5,10)+$i*100/4;" t% P2 o! H8 i% G: c( j
$y=rand(5, 15);3 ]. H0 J# ] j$ G( ]+ L
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';; `( S! m! j s& G9 y; c( C H
$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;% v2 N n" d8 w& ?$ {; k8 P
// 3.2 加载自定义字体
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$font_file = '1.ttf';9 }. J; G/ L0 `, K& |! V3 ~6 Y
$color=imagecolorallocate($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']=$code;//存储在session里% C7 R' J% ]3 w$ E
for($i=0;$i<200;$i++){2 r: D6 s! I! ?, Y
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));: p- {% ]7 o! a2 F! Z+ f9 i
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);. t: q7 D6 {5 o
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));. S4 }' W: \) V/ a+ \$ w" D P9 M; S
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);. M" l4 Q$ o- b6 A7 M. s- M8 _2 }( o
imagedestroy($image);
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?>

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form.php

<?php# Y" ]9 H! r3 a! m2 q
if(isset($_REQUEST['code'])){" O# F; @5 y, t: x# ^
session_start();- w* s8 q, R& `8 f0 U
if($_REQUEST['code']==$_SESSION['code']){; ~( A U+ \$ `, D$ Q, ~# i
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>";% a! D% `6 n, F( N% ~+ B
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?>
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<!DOCTYPE html>
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<html> z. {! d% r; T) L, K% r2 |
<head>2 d* ] T( t6 O$ |
<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">0 d# ?& D0 b, r+ k+ t, [3 }
a{
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text-decoration:none;
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font-size:30px;6 _# @: G2 c' b$ }& j9 G, d L
color:blue;/ @$ M4 m; V; r) ?1 Y) A* h
}
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a:hover{
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text-decoration:underline;
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</style>
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</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()"/>2 F9 B f" ]5 F1 g- b: X* f( D
<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 />
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<input type="submit" value="提交" />5 {0 E2 M( v! s: _& H* p7 |) j) w
</form>
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</body>" z5 Z G" C1 Y
<script type="text/javascript">
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function changeCode(){9 n, D1 Y1 S" y# E! |( a
var img=document.getElementById('img'); J5 p; q& K, g% _' n7 T0 ^
//img.src='index.php?r='+Math.random();
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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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