验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php1 v$ x* |$ c# W
session_start();: C) S+ U3 U' D' V
// 丢弃输出缓冲区的内容 **" G8 e7 a% x* P: S0 }
ob_clean();
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header ('Content-Type: image/png');
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// 1 创建画布% N. \/ j; _; l
$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);" e( m- z8 _8 z' u
imagefill($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;& S9 t; G( U# ~$ R5 h& ^- j) K( j
// $y=rand(8, 15);
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// $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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// }% ~! A+ A( u: f6 N8 V6 k
$code='';$ j; \8 P" g8 W/ @2 H2 h
for($i=0;$i<4;$i++){8 @# D; E, E# h: c
$fontSize=8;
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$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;" z) T5 a+ f2 }; N* g s
// 3.2 加载自定义字体
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$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));9 y8 ^) X6 Y1 d* |3 f$ I
// 把文字填充到画布0 h8 D; M) E& E# \' J. J
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);- Q) |- ^1 ^% s" z, n4 Y- }
imagestring($image, $fontSize, $x, $y, $string, $color);# _5 @' ]+ {" w# O! B
}
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){3 i7 E ]0 X/ n+ @4 |" N2 ]
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));3 d2 m# y( c7 c6 m
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);9 R) G( {' N) h% }
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255)); V% L4 T' |0 h* ~9 z$ m3 @; l
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);- B( x+ v1 s* O
imagedestroy($image);! a% S/ h: T/ N1 E- e$ t
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){( f" |2 w( H; N8 m3 Y6 i
session_start();
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if($_REQUEST['code']==$_SESSION['code']){" K8 z" x$ @: W/ a C" a, _
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>0 b! d6 Q0 I+ r, g9 ^' M
<html>
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<head>5 T0 z1 _% u, _; J
<meta chartset="UTF-8" />( g8 w8 P0 M2 h5 i9 L
<style type="text/css" rel="stylesheet">
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a{
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text-decoration:none;8 ?% k3 m: Y9 C- \
font-size:30px;
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color:blue;
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a:hover{1 C- a! p$ G3 u1 j! k
text-decoration:underline;- e9 ?& j5 S7 u& w2 B f
}
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</style>7 m% S! E9 [& M0 g7 O0 o3 _1 l
</head>
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<body>8 \: o4 ]( _! l6 Q2 ?
<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 />$ O6 Q) R6 a- L
请输入验证码: <input name="code" /><br />' ~, I! I8 L' t/ @- G n
<input type="submit" value="提交" />( V6 u# W$ l& A" K# T- v g3 [
</form>4 N" _" Z" b! S6 T! J) J3 A
</body>6 H$ h1 }# M, L* u8 A3 E# b
<script type="text/javascript">
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function changeCode(){
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var img=document.getElementById('img');9 B3 U* @6 C4 ?5 W- H; W$ g: d' I
//img.src='index.php?r='+Math.random();
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img.setAttribute('src','index.php?r='+Math.random());
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}
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</script>/ X1 X/ k- {+ t5 k% F8 g4 W
</html>

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