验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php3 V/ z- V8 j) N; t
session_start();
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// 丢弃输出缓冲区的内容 **$ Z7 V7 i- [- i$ P
ob_clean();
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header ('Content-Type: image/png');) S% ^8 e" s2 f! F# D
// 1 创建画布% Z+ C1 k5 I8 M( G! P8 \( ?
$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色% i' O$ t# H+ M& K* a* Q5 T+ P
$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);9 }# A9 D$ a3 ?
// for($i=0;$i<4;$i++){
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// $font=6;4 w) n& E) x+ m. \
// $x=rand(5,10)+$i*100/4;0 F9 F4 q% \8 u5 ^7 `& r
// $y=rand(8, 15);
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// $string=rand(0, 9);( |4 \6 f% u$ i* m& h$ h
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));8 M. v9 @; Y1 {' }9 j4 M
// imagestring($image, $font, $x, $y, $string, $color);
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// }
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$code='';) X7 }( ?1 [; L: R. u% F
for($i=0;$i<4;$i++){
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$fontSize=8;8 R2 O2 g% C% ~; F6 }1 n
$x=rand(5,10)+$i*100/4;+ |" Z% e3 D# k1 s/ b! q/ ]. M
$y=rand(5, 15); j% O. b- q! c" U: P) f! r( a2 p' b
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';& |5 W1 U* v$ S+ w
$string=substr($data,rand(0, strlen($data)),1);" p. H! x) P B, e) u' R! X
$code.=$string;$ p$ t# {. E$ Q6 i; N$ |0 w8 y
// 3.2 加载自定义字体# C* Q8 e7 r* I& d& u
$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));3 a' O# ~5 m! T3 _1 Q/ V: Q
// 把文字填充到画布
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//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);+ M7 m1 A' B v4 A
}
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$_SESSION['code']=$code;//存储在session里9 ]' g5 ?" R; q
for($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), $pointColor);
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));) }$ y1 y' l7 _4 E8 K) [$ s/ d+ ~/ c
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);
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imagepng($image);% q, i: Z5 s/ W# {8 n( n
imagedestroy($image); p: q! P, G# \# U/ N, U5 y
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?>

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form.php

<?php$ `2 l0 Z9 H4 ~. }+ k* k) D. V
if(isset($_REQUEST['code'])){- o6 N8 u- @) E C; S/ p/ p6 w
session_start();8 t, g! g1 M! Q3 v5 ~2 }( t$ \( J6 v
if($_REQUEST['code']==$_SESSION['code']){* j( P7 Y9 L( }0 h0 R& a/ Y
echo "<font color='red'>输入正确</font>";
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}else{" }: ?$ W* ?+ m. ?5 X
echo "<font color='red'>输入错误</font>";! t$ q- j( z7 D9 Y% {: t$ E
}
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} j4 I% m6 _# e- V
?>
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<!DOCTYPE html> Z' e% I# L& {8 ~" B U
<html>
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<head>" I. b! F9 w1 y3 M& o) d
<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">0 f3 q, m) u2 s" @4 W
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text-decoration:none;: [8 R# M8 V" c# p4 u( U7 _
font-size:30px;
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color:blue;
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a:hover{, h% p3 U a& ~6 Z$ B
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">( a7 n4 X# ~2 ^8 L! M
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>
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<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />7 a2 f C6 ~1 }* M6 z) N+ @+ ^& Q2 S4 H
请输入验证码: <input name="code" /><br />9 F! y+ `' i) i" B0 v- {
<input type="submit" value="提交" />
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</form>
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</body>
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<script type="text/javascript">
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function changeCode(){# C% G( ^; n, q0 v
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());
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}
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</script>2 j$ J1 @' ~* K; i( s% b6 {. t9 E
</html>

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