验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php" I2 a8 _+ S& K+ w8 v' [! o
session_start();
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// 丢弃输出缓冲区的内容 **! I; G5 w0 _1 l2 Q
ob_clean();
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header ('Content-Type: image/png');
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// 1 创建画布
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$image=imagecreatetruecolor(100, 30);3 n# i- i% |& k2 N1 x( E
// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);, ^$ k$ M9 G# j2 P1 c$ M
imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){
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// $font=6;$ s7 e2 L* L8 z [. B8 A: P
// $x=rand(5,10)+$i*100/4;- u) d7 I9 ]2 C
// $y=rand(8, 15);
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// $string=rand(0, 9);2 v1 ]# V0 V2 ?+ u3 I1 s2 l
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);5 H( B- y; c$ d! i2 [" L* L
// }' [1 S9 |3 Z6 D F }. d! v, Y# `
$code='';
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for($i=0;$i<4;$i++){; A& e, P: ?+ F
$fontSize=8;, I Y+ m9 p/ E3 B3 e) t
$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';+ A% d( \( z, V! _6 u" j
$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;
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// 3.2 加载自定义字体
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$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, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);
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}
# W' Y W' U! J
$_SESSION['code']=$code;//存储在session里3 s8 L( b* z# z
for($i=0;$i<200;$i++){
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$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));) n* g9 ]8 p# Z; t! P. D" h
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));
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imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);1 i; `4 R) E3 v* I
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imagepng($image);
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imagedestroy($image);
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){. l( V, Z7 @8 `! L& F" o
session_start();
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if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";% i" z' W) C: @7 Z4 ]
}else{. A4 L! q$ E# T& M; y: R
echo "<font color='red'>输入错误</font>";
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<!DOCTYPE html>3 Q* s2 g' R4 K9 }( U0 `8 ]
<html>
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<head>
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<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">
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text-decoration:none;6 `" D+ Y1 P* o
font-size:30px;' N& x3 s* r: p z) u0 @
color:blue;
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a:hover{, ]$ y1 b0 D1 D
text-decoration:underline;/ z. |) W' {4 j: j) ?7 T5 u, @
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</style>5 D5 ^2 w; Z3 k
</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()"/> ~( c m# O! \+ w$ U
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />3 t n; a# m6 [& z8 s% L- K/ G" D
请输入验证码: <input name="code" /><br />& Q4 _' f5 C5 Z: i7 O& t/ W4 K4 z
<input type="submit" value="提交" />
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</form>
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</body>4 i& C4 N% U! D1 q( k# @) _. o( E* V
<script type="text/javascript">
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function changeCode(){, e5 J6 W) r( `6 ?
var img=document.getElementById('img');
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//img.src='index.php?r='+Math.random();
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img.setAttribute('src','index.php?r='+Math.random());, o0 m6 P. Y+ c9 R! R2 q2 _1 K- v
}
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</script>
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</html>

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