验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php( Y% @( W, @# N% j7 M
session_start();
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// 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 L8 {3 p8 P! r1 U
$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);* a% G) j1 l6 X$ f
// for($i=0;$i<4;$i++){
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// $font=6;
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// $x=rand(5,10)+$i*100/4;0 Q( g6 s% J2 ^ z- ^: E5 h3 U
// $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);# J( V* n2 j0 j
// }5 W: e7 O# A& t: S* C8 K
$code='';+ v( {! r$ Q! d9 a9 T5 ?4 O, u
for($i=0;$i<4;$i++){
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$fontSize=8;
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$x=rand(5,10)+$i*100/4; G3 R, X. [6 A5 y! m& B& d4 {
$y=rand(5, 15);) S, z$ f4 q, K0 X) \4 N
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);. r: v: }( m7 f( a
$code.=$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($image,rand(0,120), rand(0,120), rand(0,120));2 b( Y; _9 l' C& R# d7 T
// 把文字填充到画布' U3 m$ h" A9 J4 z$ ~! C) \% |
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);
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}
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$_SESSION['code']=$code;//存储在session里1 |/ Q, x; o. u8 b; D
for($i=0;$i<200;$i++){
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$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));( e& n( ~+ t- ~1 @& E6 y
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);3 \( x' M' F6 b( y: M: N
}
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for($i=0;$i<2;$i++){( F a: [: I) T4 ]* b
$linePoint=imagecolorallocate($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), $linePoint);' e( H/ v' i2 z \* ^5 y
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imagepng($image);2 z& M' i$ O+ b5 B# Y3 ~
imagedestroy($image);
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){7 g+ X( M. c' `( J, g
session_start();
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if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";- j9 O. y. B: f8 `
}else{1 j( K$ r% ]: o0 Q7 Y
echo "<font color='red'>输入错误</font>";% e4 o3 R @: q$ H
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<!DOCTYPE html>3 y, f2 j" J8 K+ h l
<html>6 h3 R' R' d4 w! ]( `
<head> M# X# N, C. s- {2 x, q
<meta chartset="UTF-8" />" e8 O: U- i+ B. q4 [# V7 l0 C% r
<style type="text/css" rel="stylesheet">+ j8 k+ i" _4 Q- Y4 V, |% x
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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{
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text-decoration:underline;
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}
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</style>
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</head>! ^4 _1 B8 [; j# `
<body>+ o2 c' s/ @% }$ i: G y
<form action="form.php" method="get">; j8 f$ Q+ ^8 N- l+ `) K
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 />" i# t& j) h N! V$ M( s
请输入验证码: <input name="code" /><br />
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<input type="submit" value="提交" />- \9 b( w/ j6 E) b" j( n+ I) c
</form>& e8 |! p L8 ?
</body>: B( O! S B8 _, T
<script type="text/javascript">' }+ X# m; M. h/ Y8 A1 X
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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();
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img.setAttribute('src','index.php?r='+Math.random());0 V. @& N I' ^! a0 r/ [/ I8 ~/ x
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</script>
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</html>

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