验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php4 Y q2 I( _4 A
session_start();
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// 丢弃输出缓冲区的内容 **' c* z4 z' r' }; Y: O5 K
ob_clean();$ z- s) W) M8 J8 R. @2 ?8 E
header ('Content-Type: image/png'); @4 V) G- ^5 S
// 1 创建画布
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$image=imagecreatetruecolor(100, 30);' e% P/ g) K M8 a
// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);( z0 z/ E3 B9 ]1 `
imagefill($image, 20, 20, $color);1 z! v$ u3 N5 {: ^$ w$ D
// for($i=0;$i<4;$i++){2 B/ g' k" r( C- l. a
// $font=6;
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// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);5 u T% t3 r6 M) K- @
// $string=rand(0, 9);
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// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));6 Y' N# A9 p6 |- O
// imagestring($image, $font, $x, $y, $string, $color);
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// }
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$code='';) l$ `) V& o! v" l
for($i=0;$i<4;$i++){. M; ]9 `% F0 [8 H+ c/ ?# [2 I
$fontSize=8;$ a/ n- F+ S% t. B5 n. ]
$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);( e6 J! b# E: ?3 T
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';* a. z3 P7 {4 p5 c
$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;+ r1 v* z5 c5 @" T7 h
// 3.2 加载自定义字体
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$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));3 P' D( B; ?$ i0 ?9 t/ q
// 把文字填充到画布4 m9 _2 Y i7 ]4 ]
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);, x8 K1 D% ?4 a5 d; t
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){8 `- _0 ^, z2 _
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));% a+ P! Y( w4 O
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
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for($i=0;$i<2;$i++){& p6 M: ~) g. A
$linePoint=imagecolorallocate($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), $linePoint);
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imagepng($image);
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imagedestroy($image);, z( P- y( T: \( X% P# g
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?>

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form.php

<?php
# c: o8 O1 i8 g, n. c$ _
if(isset($_REQUEST['code'])){4 [4 R. {! n5 m! I$ r
session_start();( b" @6 Q" h5 H9 C4 y. ?: O. K
if($_REQUEST['code']==$_SESSION['code']){2 n% W( {' j8 d0 o; G7 e$ S' s
echo "<font color='red'>输入正确</font>";
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}else{
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echo "<font color='red'>输入错误</font>";. y/ Z# [0 A4 z! ]( J
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<!DOCTYPE html>
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<html>! A' O0 g) \' t: F p
<head>
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<meta chartset="UTF-8" />4 A( t: T' e4 ^" S% o% Q- p
<style type="text/css" rel="stylesheet">
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a{
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text-decoration:none;
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font-size:30px;7 H& V/ E4 v1 z' m9 M( [" @- ~: {
color:blue;
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}
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a:hover{
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text-decoration:underline;
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</style>& E$ I/ i; x- L& O0 g4 d, C
</head>" p3 y( |# D. M, I4 F2 U8 B
<body>' {+ S" W# }2 p$ P, t: o8 b
<form action="form.php" method="get">& c3 @& y" ^: M2 R
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>4 | X: m" L( ^" W, i& s, I
<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>/ S& e* m, N0 Y p
</body>* Z% l! C9 w5 A% \5 _; k' i8 ~
<script type="text/javascript">3 d& j6 E. ?" _
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function changeCode(){
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var img=document.getElementById('img');
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//img.src='index.php?r='+Math.random();* [7 [8 k5 d/ Z- n
img.setAttribute('src','index.php?r='+Math.random());, ^7 c; C( F) o7 C
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</script>2 b; O; R2 a7 f3 e
</html>

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