验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php! v g/ l% Q+ v6 I. x
session_start();1 z; X6 B4 y8 U4 f
// 丢弃输出缓冲区的内容 **1 m r) [8 F4 t& F+ P* [
ob_clean();. v6 g. v0 e9 e# J2 R9 m7 d- ~" f
header ('Content-Type: image/png');
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// 1 创建画布3 e9 g. a9 q/ } w9 e3 }+ f1 g! J' I
$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色( M# X/ C' S4 {* d2 X% d$ \
$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);9 a# ] K5 y' D& L
// for($i=0;$i<4;$i++){# z! k7 E( Y, q8 A9 H
// $font=6;
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// $x=rand(5,10)+$i*100/4;1 p+ l7 x- h1 I; y4 V; ~& Q. P
// $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));$ _6 n, q$ [; Z U
// imagestring($image, $font, $x, $y, $string, $color);
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// } j7 B& e2 f. ?) J
$code='';
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for($i=0;$i<4;$i++){* ]$ e3 a) K7 W
$fontSize=8;6 Q. y. b3 D9 }3 a/ i; G4 `- d
$x=rand(5,10)+$i*100/4;) X5 C$ b2 F- X# t) I
$y=rand(5, 15);! [8 j1 U, k" }% H9 P# o& Z
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';. t' q; D9 y: Q ^ ~
$string=substr($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';, z5 R. h& J6 p F
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));, K, N2 L( E' M- h/ g4 s+ ~! M$ C& B
// 把文字填充到画布) K& A, H; u& u+ V0 Z- V
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);% n; O( g, \5 W; L" y3 |
}
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){# C/ |" V F O" }$ J; z' J
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));7 {7 B: }# C/ O* V
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);! `# ~- b) e4 W* A8 V2 ~% H
}
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for($i=0;$i<2;$i++){- ~! v% Y0 ?9 V
$linePoint=imagecolorallocate($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), $linePoint);4 q% a! t7 }* e7 l6 K7 L
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imagepng($image);
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imagedestroy($image);* v% s9 `# Q n; Y
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?>

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form.php

<?php# ?8 x) X) n, r6 w3 S
if(isset($_REQUEST['code'])){
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session_start();
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if($_REQUEST['code']==$_SESSION['code']){5 r, c& R! _- u$ ]4 r8 ~
echo "<font color='red'>输入正确</font>";
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}else{8 s- P6 ~% A* y: O1 H
echo "<font color='red'>输入错误</font>";
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}
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}
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?> t- K( o/ }6 d( p! k
<!DOCTYPE html>
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<html>
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<head>$ J4 X' m ~0 x1 H9 B# c2 }
<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">
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a{
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text-decoration:none;: z" o2 d( ?- |9 B: b/ C
font-size:30px;
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color:blue;) N+ f+ M" n" a% T2 I
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a:hover{
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text-decoration:underline;/ L. f- ]0 U d: y" d6 [
}
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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()"/>' q: ~' t0 r- j0 c- I/ F
<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 />1 M% H+ M. M- A$ G9 e* ~) Y% I, C
<input type="submit" value="提交" />
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</form>' [. w! w7 s: _* ~
</body>' \; s. [: W- s+ n2 X$ |+ `* h& X
<script type="text/javascript">* A2 U$ @+ o* ~ O- v) q
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function changeCode(){% h, x: c- \7 e6 R8 l Y Y; _
var img=document.getElementById('img');7 ^+ c: s/ @9 d5 J% f, H& _. Q5 \+ q
//img.src='index.php?r='+Math.random();
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img.setAttribute('src','index.php?r='+Math.random());
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</script>
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</html>

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