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admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();
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// 丢弃输出缓冲区的内容 **
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ob_clean();
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header ('Content-Type: image/png');! ^# ?4 o, L' S! L
// 1 创建画布" w/ | w, C& Q2 J' C1 A
$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);* [" R" M; o% y) z4 q
imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){
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// $font=6;# \* W* i; z. S" }3 ^
// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);
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// $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);- y9 v, E/ y0 S9 G! j
// }7 N3 i' K' c7 U, p; A
$code='';' S0 h% y) ~" n# l; u* X
for($i=0;$i<4;$i++){& z4 j% S! F* w0 C k/ G
$fontSize=8;& g8 W% ?, b% K% u8 y' X0 S
$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);5 W# V! j+ `1 ~4 Q2 |) ~6 @* ^
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;, J7 o, |, w+ M) m- q
// 3.2 加载自定义字体3 Y7 V+ r2 j8 x4 i% }: D
$font_file = '1.ttf';& Q& ]. F/ T6 C! q( K, F+ S T
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));9 Y/ t2 U! b& T! \4 P/ O3 P& W. M
// 把文字填充到画布
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//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);/ H) T" K1 K) L1 C
imagestring($image, $fontSize, $x, $y, $string, $color);6 d% f: Z v6 G" r+ s0 R
}
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){4 N1 ], X2 [7 K5 r8 [3 M& N7 q2 Z$ q
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));/ u6 }) F; q* b9 X8 `" g. P
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
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}
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for($i=0;$i<2;$i++){' A9 o% W# S" O7 ]
$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));" f. p+ d$ f* J* v' b
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);0 \ x/ B) ]$ {* D, `- J
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imagepng($image);' v1 ^! w+ V& _7 b. [+ j
imagedestroy($image);
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?>

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form.php

<?php5 G9 x/ i* E5 P. u1 ]
if(isset($_REQUEST['code'])){. _7 h- o- `" C- f8 r+ P* l
session_start();* Z! z8 ^* Z, P0 m, v2 A
if($_REQUEST['code']==$_SESSION['code']){6 a$ T2 ^4 }) N( b1 h
echo "<font color='red'>输入正确</font>";
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}else{$ O6 j8 \) ~$ Q
echo "<font color='red'>输入错误</font>";
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?>
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<!DOCTYPE html>, v. V Q1 C0 z0 G9 j, }9 e' i4 [
<html>% y1 C: d: p% L, |: X: H
<head>
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<meta chartset="UTF-8" />$ a) m$ R, I+ G
<style type="text/css" rel="stylesheet">
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a{: X1 r/ j8 Y T z9 {8 A
text-decoration:none;0 O- A2 h; G% d' B% b$ n; Y
font-size:30px;, ]+ [0 o$ B, q% [
color:blue;: V/ T L( J* _7 D' F O
}
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a:hover{5 s0 S8 E1 _) Z4 c: }/ |
text-decoration:underline;6 ]! e% Q4 k& Y# a9 h
}
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</style>1 i- O/ G% Q4 r3 {
</head>
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<body>
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<form action="form.php" method="get">
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>9 ~3 p3 x& u* C3 ^; M
<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 />! O2 [+ F* W8 O) p
<input type="submit" value="提交" />
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</form>$ v: U Y. z, E5 p2 s6 X4 W8 [
</body>
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<script type="text/javascript">
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function changeCode(){) [8 y6 I( R/ x5 v! T3 d2 a
var img=document.getElementById('img');
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//img.src='index.php?r='+Math.random();% V& \# J5 R4 t
img.setAttribute('src','index.php?r='+Math.random());( J M5 ]$ s; j( n; \
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</script>6 i& u& N6 F; Z5 f7 u+ C5 M
</html>

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