验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php+ z( Y( E) ^# @$ {: w
session_start();
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// 丢弃输出缓冲区的内容 **
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ob_clean();$ ~) h9 \/ Q+ d1 r8 Z/ A# H
header ('Content-Type: image/png');
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// 1 创建画布5 j) N. u4 ?# K, E
$image=imagecreatetruecolor(100, 30);' S7 D. k5 T1 }. E8 j, U
// 2 画一个矩形并填充背景颜色为白色
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$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);8 }9 f5 E( u! {# N' Z% w* p
// $string=rand(0, 9);
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// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));. \3 a. Q6 z3 }# d! \& y6 b9 X
// imagestring($image, $font, $x, $y, $string, $color);
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// }/ S6 f2 ~1 D$ I6 l
$code='';
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for($i=0;$i<4;$i++){
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$fontSize=8;( v; w7 x9 s$ e7 n7 P
$x=rand(5,10)+$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.=$string;
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// 3.2 加载自定义字体; @' k$ D' O0 F* f" p2 X, {5 r! R
$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));1 O' H7 U& X4 f
// 把文字填充到画布
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//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);1 a; Z( [# f5 S1 h
}
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){. C6 B$ Z; p4 Q) K5 C D- y% ^
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));. U0 Q- e5 ^" P9 J
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);5 X( u5 w f0 f. z$ O) T
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for($i=0;$i<2;$i++){7 f% I% Y( p3 G& Y \( s' e
$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));$ F* E# m* m* W! _8 }! w4 w% ]# R
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);6 k) N) c# ]) d* o& v& [: u
}
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imagepng($image);
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imagedestroy($image);# X6 Y* C5 `# J2 @ C9 T# `7 E: y
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){* N# f2 J B% P5 S* \6 m
session_start();/ `, J+ \- f0 D" j
if($_REQUEST['code']==$_SESSION['code']){& z( m2 `* k4 [8 I' [& ?
echo "<font color='red'>输入正确</font>";
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}else{7 Z) ^* q9 H N% H* H2 e
echo "<font color='red'>输入错误</font>";' ]% W% L6 P+ K7 g7 b: c3 ^
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?>
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<!DOCTYPE html>: V2 E8 b* p/ k, T w, c n6 r
<html>+ i$ d+ t. F% f: |) j
<head>
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<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet"> i# C( z) K" o$ ? ]
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text-decoration:none;
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font-size:30px;
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color:blue;
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}
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a:hover{: J( x3 x+ \3 f/ k/ K5 p
text-decoration:underline;6 I7 F/ f- p8 e9 B1 x
}
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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()"/>- b! s8 E5 y `7 e' Z
<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" />6 c+ ^) t5 V- Z' ]. u9 m
</form>
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</body>+ B3 ~! F, c9 `9 K! h
<script type="text/javascript">
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function changeCode(){
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var img=document.getElementById('img');5 H5 X8 h8 u8 Y: v9 W" w/ k. V
//img.src='index.php?r='+Math.random();/ F3 B( z- j( G0 X( |, M
img.setAttribute('src','index.php?r='+Math.random());
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</script>
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</html>

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