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admin · 发表于 2018-12-16 01:00:13

index.php

<?php/ W( y6 i I6 p
session_start();
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// 丢弃输出缓冲区的内容 **
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ob_clean();% M9 T4 {/ j. ~8 p2 _: }
header ('Content-Type: image/png');
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// 1 创建画布' |4 B) Q2 i) M8 K _
$image=imagecreatetruecolor(100, 30);$ F3 e8 g* Z, J7 c/ H# }: z
// 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);
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imagefill($image, 20, 20, $color);+ o C3 d, x! \; s# v5 q9 ]
// for($i=0;$i<4;$i++){$ F2 @; ]4 ?9 L( q! V; N5 t8 [
// $font=6;
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// $x=rand(5,10)+$i*100/4;2 J7 n' M2 ?9 z% w; s9 X4 U% a5 u" [
// $y=rand(8, 15);. C( j/ e- D8 K3 g1 \
// $string=rand(0, 9);3 v! W* x$ o+ s' D3 f" m
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));0 R% ~9 m0 ?, j, b0 _1 N$ v8 E
// imagestring($image, $font, $x, $y, $string, $color);4 \! X. y. }0 h7 O) @3 J7 ?
// }7 L: m8 S# S' {7 x0 I
$code='';3 t( U7 R" e% n1 b+ @
for($i=0;$i<4;$i++){
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$fontSize=8;
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$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);
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$code.=$string;
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// 3.2 加载自定义字体- J3 {* w/ P+ @
$font_file = '1.ttf';$ y, h; v, u( ~+ H' |( g/ g, V7 s+ h
$color=imagecolorallocate($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, $string);3 x3 b( @1 O* {1 i
imagestring($image, $fontSize, $x, $y, $string, $color);
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$_SESSION['code']=$code;//存储在session里( ]2 |' n9 j4 A% s3 r' k
for($i=0;$i<200;$i++){1 D; O- A# c; k, \% b! N/ F' k
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));9 [, ~. a9 R3 M; X" ^& I, n
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);9 r, I6 Y8 Y6 e# d
}
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));
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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);; B. S. [% F2 d u, d& l% S4 }
imagedestroy($image);: v' o, ?) d3 @
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?>

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form.php

<?php( E( h) w7 G' H, B) G* h
if(isset($_REQUEST['code'])){3 z* S2 `7 Y% f8 K# S% C
session_start();& c* f4 y/ [! N- @
if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";
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}else{: |, r" ^# f: X! |# I( h
echo "<font color='red'>输入错误</font>";
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}- I0 y2 `/ |9 t2 g) K
}
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?>6 |9 u+ k' t. ~7 Z( [$ m
<!DOCTYPE html>
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<html>, D) L1 q- j! E, M P/ h) T( k
<head>
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<meta chartset="UTF-8" />) R/ d1 Z9 A) b/ E
<style type="text/css" rel="stylesheet">
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a{
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text-decoration:none;7 U7 l6 Y% {' T6 y3 t. B G* Q
font-size:30px;
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color:blue;, q7 K% k9 J& G; `# r+ r8 U4 r; M
}
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a:hover{! |; g! S1 ~4 Y5 V4 D5 F- y) ?
text-decoration:underline;
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}
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</style>- o4 `0 F8 r3 M1 r7 e- ~
</head>7 k& S, r3 b& }! C y
<body>3 |' C5 f- J! q) `* ?: o
<form action="form.php" method="get">; N5 g- V& H N% R3 W2 O
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>1 G, ~" Z/ W- P
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />- }5 e) ]4 ^1 b" ^, T- f
请输入验证码: <input name="code" /><br />/ ^- D1 u# \2 P' g8 u, _% i
<input type="submit" value="提交" />1 p+ K6 q4 p* L p! {: A$ B
</form>3 {- F* Z+ u. Q) @9 s4 W
</body>5 R6 a; C' _7 @* j0 m# K
<script type="text/javascript">: v+ N5 I# t* Y* A; {3 k
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function changeCode(){+ u4 ~" `# Q$ q: D. f
var img=document.getElementById('img');
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//img.src='index.php?r='+Math.random();& }4 s u! P5 X- u' G
img.setAttribute('src','index.php?r='+Math.random());' s6 E1 H; i6 N6 d& H; J3 f+ q8 c
}
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</script>* ?( i' }' j" |7 ~1 t
</html>

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