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admin · 发表于 2018-12-16 01:00:13

index.php

<?php! Z' \- J* _9 m) L- A
session_start();
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// 丢弃输出缓冲区的内容 **/ ^0 N3 G4 S: a9 P- }$ O% n* v W3 z
ob_clean();
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header ('Content-Type: image/png');: f1 B9 A, u E
// 1 创建画布& Z7 g; U' E" z
$image=imagecreatetruecolor(100, 30);/ h1 H: N& @2 v. {! Z0 D' t" r
// 2 画一个矩形并填充背景颜色为白色* q, e" b6 |! \( r$ N4 z, @& J
$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){: O& y& A4 C+ [! ?) k2 k4 N6 n4 A
// $font=6;8 t- x g+ @ H0 N7 P& X
// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);, V$ r4 _9 f5 |/ }' H
// $string=rand(0, 9);9 p4 T+ k/ ^7 v
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));0 W; z/ R# }7 L+ c% j# Q, P' [- p
// imagestring($image, $font, $x, $y, $string, $color);8 z4 [0 I4 @8 D, r
// }
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$code='';
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for($i=0;$i<4;$i++){
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$fontSize=8;: x, o! s$ i2 U0 l( d1 q
$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';+ i7 y# O% g8 n9 c6 S
$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;
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// 3.2 加载自定义字体
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$font_file = '1.ttf';* S/ c5 K$ T: _ K
$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);+ m; V/ v& Q( z1 K# D
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++){
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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);, I1 X. Q8 s+ H1 s4 \) M
}; z" K0 y% D& X
for($i=0;$i<2;$i++){. y5 {* ^1 w' S* m, a* E9 Z# ?
$linePoint=imagecolorallocate($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);
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){
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session_start();" c) `( F2 E. N/ }: Z$ W: y
if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";: B# d$ j1 `9 K4 X0 c, w
}else{
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echo "<font color='red'>输入错误</font>";6 E$ w3 j# f- X" a+ y. y
}
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}
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?>
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<!DOCTYPE html>9 W3 I7 o+ j. a' h7 u
<html>
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<head>' n' M% V9 P' u: D- T6 ]6 n! z, a
<meta chartset="UTF-8" />" E- \! S0 t% T; b
<style type="text/css" rel="stylesheet">1 u4 o9 c6 T+ @; [9 x8 Q) x6 R
a{
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text-decoration:none;9 c3 V- ^7 W! h# `% \9 R# S5 c% o
font-size:30px;1 y* T- U* U; e3 r7 u' l
color:blue;$ q0 [3 c& z. V, E
}
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a:hover{
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text-decoration:underline;
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}
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</style>
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</head>; y& l) D% O" h1 y; m
<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()"/>/ |; }- p% W' ~2 \" _3 L
<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" />
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</form>5 v) b# M" ]5 F5 H+ \4 ~7 Z' ?
</body>4 S5 z& s7 s! o8 u( i( U
<script type="text/javascript">
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function changeCode(){# X8 l2 |$ x3 u$ F& F1 b
var img=document.getElementById('img');
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//img.src='index.php?r='+Math.random();
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img.setAttribute('src','index.php?r='+Math.random());0 n) M' q$ `8 |6 g- F% p8 l. J
}! H# a" S4 G* L
</script>
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</html>

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