验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php: K( R `! o3 W+ N+ ?+ e! e: z% x
session_start();
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// 丢弃输出缓冲区的内容 **# L( a X$ \3 E
ob_clean();
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header ('Content-Type: image/png');
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// 1 创建画布* j" w* j* e. D0 K" Q: Q
$image=imagecreatetruecolor(100, 30);% q. l5 N5 m8 a `: J( w
// 2 画一个矩形并填充背景颜色为白色- y0 F/ M' g& D9 D. h
$color=imagecolorallocate($image, 255, 255, 255);9 b. v3 l: m7 ~9 V1 p6 A
imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){9 N% R9 ], f* S
// $font=6;: h) ^3 o& e2 e/ d* {4 @, ^
// $x=rand(5,10)+$i*100/4;# Q$ J: r9 f+ K2 e8 f
// $y=rand(8, 15);
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// $string=rand(0, 9);& t5 s5 O+ i7 ^; K! U
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);- b y# y$ k' I7 n
// }9 n& M+ Z6 U% m/ Z$ _7 a- j% u a
$code='';' J" w3 a! A: t9 e' V0 L, ^9 D
for($i=0;$i<4;$i++){
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$fontSize=8;: B5 \6 G- p% h
$x=rand(5,10)+$i*100/4;0 U! d B6 {1 V
$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);" w$ v; S: G7 m& c* x5 x
$code.=$string;7 K' ?& V$ I* L1 j" G
// 3.2 加载自定义字体
$font_file = '1.ttf';& {& K5 r* Y3 N+ v* i
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));0 N. N4 Y) c- x% r! {
// 把文字填充到画布
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//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);( Y0 z- v9 c3 F$ D
imagestring($image, $fontSize, $x, $y, $string, $color);
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}
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){
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$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));( u3 s; T; @& y+ s: a
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);% a2 r k; R$ [
}
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for($i=0;$i<2;$i++){" q; @& p y ~& d* H
$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));8 v3 I( q) C. H( g
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);
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imagepng($image);4 _3 m, q% m% l8 d$ h
imagedestroy($image);
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){
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session_start();
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if($_REQUEST['code']==$_SESSION['code']){5 Y H* A+ h9 Y6 X/ j. G
echo "<font color='red'>输入正确</font>";+ w- a. a7 Y6 m4 ?
}else{
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echo "<font color='red'>输入错误</font>";
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}
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?>
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<!DOCTYPE html>$ b. r2 U9 E: b3 R- \, w
<html>
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<head>
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<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">: M# V5 B' g! k2 e7 g
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text-decoration:none;
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font-size:30px;
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color:blue;
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a:hover{
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text-decoration:underline;
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}
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</style>
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</head>& |) l: X5 T7 c' l- p- J0 z5 w/ p- m
<body>- k' T' f0 m) ~" w7 z
<form action="form.php" method="get"> Z. i q L6 |# ~# `
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 />9 h( N w8 s5 u0 _( ~
请输入验证码: <input name="code" /><br />
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<input type="submit" value="提交" />0 f+ T* V9 G) i
</form>: ?6 ~+ X2 m; h5 g
</body>: ~) A4 G8 h* K8 P
<script type="text/javascript">
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function changeCode(){0 I2 S+ `5 w9 N! [( p: Y5 `
var img=document.getElementById('img');0 }1 O3 t- H2 e" q
//img.src='index.php?r='+Math.random();+ v6 f3 P( p( w/ W1 B" }
img.setAttribute('src','index.php?r='+Math.random());
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}) {8 ^ Q( Z3 V! T% R; \( [* i
</script>0 p, o- x. n/ m- N
</html>

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