验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php5 M7 J1 k2 u6 Z/ C
session_start();1 U: [+ e, t3 a) W I% @. f: o7 [
// 丢弃输出缓冲区的内容 **
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ob_clean();
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header ('Content-Type: image/png');
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// 1 创建画布/ H' E& E9 j) O
$image=imagecreatetruecolor(100, 30);4 s* j7 ^% j( U5 S
// 2 画一个矩形并填充背景颜色为白色
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$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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// $font=6;7 E$ e8 e n$ V+ s& I
// $x=rand(5,10)+$i*100/4;, }5 `" N. }" n( D( U, y& ]
// $y=rand(8, 15);
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// $string=rand(0, 9);0 Y9 j' x* B/ d# m. ?
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));7 V* Y* w+ x6 s2 @, E3 q% C
// imagestring($image, $font, $x, $y, $string, $color);; l1 D, g* J \2 U3 w6 m
// }" |* D1 F# N+ C, R
$code='';
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for($i=0;$i<4;$i++){$ w, D g/ T' K5 D' ]- d
$fontSize=8;9 G& }& D: |/ G; [( x$ M
$x=rand(5,10)+$i*100/4;* K/ {1 o6 x" D5 l* o) w
$y=rand(5, 15);1 i! n( I( o2 u% K7 c" D' |' r, Q) Y, W
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';* U! ~% p) U; |# d$ c
$string=substr($data,rand(0, strlen($data)),1);+ X" l* `. l# d5 z& d+ \
$code.=$string;
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// 3.2 加载自定义字体
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$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
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// 把文字填充到画布
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//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);. }% u9 }9 p" \* i, K3 N4 C
imagestring($image, $fontSize, $x, $y, $string, $color); {7 z% y, {+ _ V; }
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$_SESSION['code']=$code;//存储在session里+ D! _6 G9 b$ |, x' `% g
for($i=0;$i<200;$i++){
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$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));0 N, i! I+ x0 y1 W
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);: \& a' U9 W. h
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for($i=0;$i<2;$i++){1 L( S( c0 b) p/ n1 d* G
$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));* i+ h3 V) ]" Y/ f Q- f
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);
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?>

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form.php

<?php z( p& O( s L3 P
if(isset($_REQUEST['code'])){
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session_start();' p5 B) K7 A5 E; b' v% g
if($_REQUEST['code']==$_SESSION['code']){3 P) m- z+ D6 A/ u% J
echo "<font color='red'>输入正确</font>";
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}else{
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echo "<font color='red'>输入错误</font>";
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}
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<!DOCTYPE html>
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<html>
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<head>
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<meta chartset="UTF-8" />' `5 {+ N/ i- O1 S6 `
<style type="text/css" rel="stylesheet">$ k: L$ `+ [8 u# J
a{
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text-decoration:none;/ H+ p6 o/ T E; w: @) {
font-size:30px;
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color:blue;5 ?% ~" j4 ]2 C7 `/ G+ v3 g
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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>
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<body>( K- F4 X; P" X2 h
<form action="form.php" method="get">
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验证码: <img id="img" src="index.php?" onclick="changeCode()"/>+ l8 s. a6 d' p9 x& p: v3 P
<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>8 c6 r- m. s" @
</body>$ Q! o' Y; W/ Q0 h# m5 v
<script type="text/javascript">
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function changeCode(){
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var img=document.getElementById('img');. g/ }, Z" _' i, `( x: Y0 m) `. @
//img.src='index.php?r='+Math.random();: Q% F8 y0 f. ]6 s# Z1 s0 M
img.setAttribute('src','index.php?r='+Math.random());# |) I! C) q8 I) o/ m. D7 z
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</script>5 A( D) c# F1 D: y4 n5 ~6 h
</html>

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