验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php; ?/ l; E N. Q: s# i
session_start();
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// 丢弃输出缓冲区的内容 **
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ob_clean();; t* P6 D7 N7 t. o& C5 N: \! w
header ('Content-Type: image/png');
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// 1 创建画布
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$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);% v$ B6 }. \! j+ Z- c- t
imagefill($image, 20, 20, $color);) h' B! e8 s( e3 \6 _: p# y
// for($i=0;$i<4;$i++){
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// $font=6;0 P" I% v! ?0 I; A7 M
// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);* y6 A4 d q, ?4 t
// $string=rand(0, 9);4 ~* {5 h, [9 h/ g0 m
// $color=imagecolorallocate($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='';# z" }' J/ a7 H) j
for($i=0;$i<4;$i++){
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$fontSize=8;; ]; \4 g* `" h
$x=rand(5,10)+$i*100/4;* T3 N, `2 f5 k: \2 e
$y=rand(5, 15);* L S2 @% @ C' R+ L
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$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9 A8 @; Z5 }0 p* V) V
$font_file = '1.ttf';
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$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, $string);+ V1 ?" h# K9 J, J* {8 r+ W5 j& a! ^
imagestring($image, $fontSize, $x, $y, $string, $color);& T% F& Q0 V7 n8 E- d
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){4 b% @ ?- T+ ]/ j6 _
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));1 _( N- q3 `* s9 ^" S
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);' H- u5 U6 v7 D( T* f
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));: Q+ G% ^1 K, j6 ~7 u+ ?5 N5 w
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);
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imagepng($image);/ b2 z) r7 Q) L& k* `) U/ p- ] _
imagedestroy($image);
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?>

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form.php

<?php9 m# _8 z1 z2 n+ e; T
if(isset($_REQUEST['code'])){' w! N* x/ N4 l `* B' d
session_start();% O* n* O" e1 k% [% w
if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";
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}else{) _4 X0 T4 u% o# @8 T% [0 d( s
echo "<font color='red'>输入错误</font>";4 {' t* p7 C" W' W/ G' O+ r* K
}
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?>
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<!DOCTYPE html>$ t* P8 O+ i2 q1 F$ ^
<html>
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<head>9 G& A' C* `" x$ |
<meta chartset="UTF-8" />2 N7 p2 n$ ~' k; f
<style type="text/css" rel="stylesheet">0 r5 K& X. K+ @4 q. O
a{
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text-decoration:none; [$ o6 F" }# ~& g: `0 x4 L% I- o
font-size:30px;# ^7 T6 y; j/ i5 I
color:blue;
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}
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a:hover{* X( v1 e1 S0 _& |4 b
text-decoration:underline;1 R2 _) p. d8 ^4 Y/ Z e' [
}
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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()"/>
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<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 />- Y# B* P$ }' a; H2 F
<input type="submit" value="提交" />
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</form>
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</body>
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<script type="text/javascript">9 f2 I- V' o1 L' L( W7 R4 D+ j
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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();# n, U( R7 }) C/ |
img.setAttribute('src','index.php?r='+Math.random());" h4 r% S" \. Q1 `6 ], o0 Y. Q
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</script>
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</html>

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