验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();3 E9 a# H% {# \3 N
// 丢弃输出缓冲区的内容 **
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ob_clean();- X6 W8 n: c/ i3 z, h
header ('Content-Type: image/png');6 ^+ i) J2 B" B' q0 ?$ f
// 1 创建画布) ?& r2 T/ S% H3 q" w
$image=imagecreatetruecolor(100, 30);" V! |; F' A8 f+ _. N8 d$ O4 [% o
// 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);
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imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){
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// $font=6;
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// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);: y- {2 k4 O3 Q) w% m' _/ i6 l
// $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, $color);
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// }
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$code='';
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for($i=0;$i<4;$i++){9 G* l: s) O6 x/ b/ Q8 d/ A B
$fontSize=8;
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$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;( `* K! G$ g9 X. v
// 3.2 加载自定义字体8 J& K, A" D+ [! A8 R K" ?
$font_file = '1.ttf';! l* Q1 W+ m6 j3 G/ r8 w" T
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));1 @$ h' o$ I }2 z# F1 l
// 把文字填充到画布+ W8 L" C( \" M" Y8 A0 p: G5 @
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);5 s* |& P! o2 t' V/ _0 d2 D% X6 ^
imagestring($image, $fontSize, $x, $y, $string, $color);
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){ V! F1 ]2 ^. l0 i' F; x
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));
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imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);) s |' ~2 D4 H4 b. a" l
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for($i=0;$i<2;$i++){) g( u, r$ K; _$ [3 @% j
$linePoint=imagecolorallocate($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), $linePoint);
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}
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imagepng($image);! n4 S- v- B8 s- X) ~
imagedestroy($image);
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?>

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form.php

<?php0 \0 L8 n6 o7 H" v
if(isset($_REQUEST['code'])){
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session_start();0 w) q0 }" T# f
if($_REQUEST['code']==$_SESSION['code']){# y, v. T, C( f7 G! X' m0 b
echo "<font color='red'>输入正确</font>";
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}else{* v/ u( T% G, m1 z5 G, E3 m5 m
echo "<font color='red'>输入错误</font>";8 `* y x4 w8 i6 o; L
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}
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?>
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<!DOCTYPE html>
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<html>' ~: y0 `2 E, }" x3 X& R# T
<head>/ |' ^% d' R9 q5 ?8 b0 z; X
<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">
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a{
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text-decoration:none;) T1 v, W, k$ [9 E# ]
font-size:30px;" K6 J6 L# n/ {) ]4 s
color:blue;1 w) a0 J1 o/ q" k. p
}
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a:hover{
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text-decoration:underline;' I$ O* K8 ]5 E. D* {/ P0 D
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</style>0 t$ N% P3 w, h6 g6 J
</head>0 r) X. m# b% ]+ |( M
<body>
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<form action="form.php" method="get">7 N* e) c- Q) H* u' E
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 />$ @; `- P( g% b+ I
请输入验证码: <input name="code" /><br />9 t% Y/ D8 }2 }! `3 g& O/ o
<input type="submit" value="提交" />
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</form>
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</body>
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<script type="text/javascript"> N9 R7 t" ?- p: V6 p
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function changeCode(){& n% \: x5 e& [: s1 ^) V; r
var img=document.getElementById('img');3 }4 p3 F0 L' c# B5 \& K, A
//img.src='index.php?r='+Math.random();
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img.setAttribute('src','index.php?r='+Math.random());- X+ f7 x8 X6 ?( Z% s1 x; K
}
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</script>+ [ f5 }6 S+ k* z8 h
</html>

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