验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php: H. Z }) \5 z- h+ p1 W+ Q' Y1 `
session_start();. y/ s' M0 M5 m; j0 U: t
// 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');% w, F! L# V& o+ v/ C
// 1 创建画布7 \: o$ }6 y' R, }8 |
$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色* p8 R/ e9 o/ \ }( z
$color=imagecolorallocate($image, 255, 255, 255);0 |0 G6 d6 F. _" C7 K3 Y, I
imagefill($image, 20, 20, $color);: T$ \! m, \1 g/ U: ~4 G( f) {
// for($i=0;$i<4;$i++){, g1 v2 e( T; T1 G; Q1 I4 {# o
// $font=6;
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// $x=rand(5,10)+$i*100/4;
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// $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);5 M( ]8 t; }/ a! `) R
// }, w: o8 _/ X& {/ J1 d3 s
$code='';+ T/ ]$ e4 Q5 h6 m( m
for($i=0;$i<4;$i++){3 A$ @; U5 x8 p
$fontSize=8;
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$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);" ?+ h/ H1 Y" I& ^
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;3 H' _# L# |) V" N1 F
// 3.2 加载自定义字体# z! K5 q- h# a' K9 H7 _
$font_file = '1.ttf';4 N) J" g. _3 q7 N& g
$color=imagecolorallocate($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, $color);
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}
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$_SESSION['code']=$code;//存储在session里- }# m3 T4 D% E$ J& P2 i1 }
for($i=0;$i<200;$i++){) {, v8 e1 M+ @# J! n* l: K- P6 _9 z
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));
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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));( E4 P2 E+ J6 K4 t r
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);
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imagepng($image);2 a5 Z, v/ ^4 Z
imagedestroy($image);
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?>

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form.php

<?php
% a) U. ^7 y2 E8 t" G1 w
if(isset($_REQUEST['code'])){
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session_start();
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if($_REQUEST['code']==$_SESSION['code']){+ G0 C3 y3 f- F @2 j0 t% I
echo "<font color='red'>输入正确</font>";( O. d5 T1 R' J: L
}else{+ I' a+ ^, _9 w! Y
echo "<font color='red'>输入错误</font>";9 Z( t: X* O( @6 ^* V( y/ N
}
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}
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?>
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<!DOCTYPE html>9 v( t3 `7 b& R5 _% I# K) K
<html>4 ]" M0 a8 Z6 O2 _% h- q
<head>0 s, x( ^- K$ B. y9 w( [
<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">5 K3 x' l& b' a# z4 |6 D& T
a{
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text-decoration:none;8 y1 E8 x, C; U* D
font-size:30px;, k7 b) a. Q$ l4 L: H
color:blue;1 h6 O4 [0 z5 v7 ], b2 w" P
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a:hover{
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text-decoration:underline;
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</style>
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</head>2 _9 A ~$ M9 ~, K# `( p3 t
<body>: D4 k6 _! R( w
<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 />
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<input type="submit" value="提交" />/ b; P/ f; A& Y+ Z- X U0 y
</form>) Q% N" U( ~8 z# D
</body>
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<script type="text/javascript">
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function changeCode(){5 { i$ _2 M+ x4 p( \3 G0 Z
var img=document.getElementById('img');: c r1 k6 T! v# n X! Z3 p% d. J" X
//img.src='index.php?r='+Math.random();
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img.setAttribute('src','index.php?r='+Math.random());
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</script> m* N1 d3 D T6 S
</html>

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