验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();
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// 丢弃输出缓冲区的内容 **4 Q5 C6 o2 j5 Z/ _1 l& @# j
ob_clean();% g( Y3 j* a) @' T- n
header ('Content-Type: image/png');& W8 V7 g* p k2 ~
// 1 创建画布
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$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色8 P' r. i0 v; h# P/ W5 H8 r6 m/ N
$color=imagecolorallocate($image, 255, 255, 255);9 J4 m' S% k2 M# q
imagefill($image, 20, 20, $color);9 u) E- k% |7 [0 d% J; F/ p6 [
// for($i=0;$i<4;$i++){
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// $font=6;
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// $x=rand(5,10)+$i*100/4;# m4 H! n- e y
// $y=rand(8, 15);9 [4 Y' l/ }$ o3 N$ o3 k
// $string=rand(0, 9);* H. D! B9 d* u( d1 m, B4 ^) U1 \1 k3 M
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);
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// }
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$code='';: k, y' h0 Z1 u" O7 m; Y' }: f6 @
for($i=0;$i<4;$i++){
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$fontSize=8;
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$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);8 c6 P0 N3 Z6 y3 x. M
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$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, @& P: e+ i, D1 j1 W
$font_file = '1.ttf';. f6 t; _) H. j! K( R. W4 h
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
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// 把文字填充到画布" W }5 ^0 U& V! [' n" A0 v/ Y* c
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);) O7 @) r, l: R+ h, w: X8 N. |2 r8 i
imagestring($image, $fontSize, $x, $y, $string, $color);
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$_SESSION['code']=$code;//存储在session里, b( [/ U q7 M, L, p# ~
for($i=0;$i<200;$i++){: l; h3 ~# A$ w. Q( H8 B
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));
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imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);. j* i7 k8 J) ?! X
}
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));3 I; _9 z# y- `; Y, u
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);) c2 ?% m- @: T$ T
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imagepng($image);# S9 s/ K2 K& a: J
imagedestroy($image);
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?>

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form.php

<?php3 C& {8 @* s+ }4 }+ g# E! j7 Z
if(isset($_REQUEST['code'])){- W+ B2 [0 w |/ h
session_start();3 @8 O7 w6 w H7 @% |% a
if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";% u: b, Y& d9 ]" L I0 s- ]
}else{
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echo "<font color='red'>输入错误</font>";
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}
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?>
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<!DOCTYPE html>+ v% V, R% r/ k& C3 o3 L
<html>
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<head>
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<meta chartset="UTF-8" />+ {3 R7 O- ?4 G2 L* D0 l
<style type="text/css" rel="stylesheet">2 e! L/ v! K9 ^" O+ f1 g7 F0 ?
a{
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text-decoration:none;
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font-size:30px;3 n! ^2 a5 c& S9 |: g6 @3 p
color:blue;
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}
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a:hover{1 s% r. P5 S: j# e$ \
text-decoration:underline;- u3 m0 T" c9 \, E4 }8 _! S7 |
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</style>
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</head>
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<body>( d- O- j i9 H# e- n+ ?/ F& u5 S
<form action="form.php" method="get">
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验证码: <img id="img" src="index.php?" onclick="changeCode()"/>, K) F2 `" V# E& i
<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 />/ ]8 k& n' P% o. c2 v
<input type="submit" value="提交" />
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</form>( e/ l- S( Q% ~8 v& K
</body>
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<script type="text/javascript">& ]0 a! a0 E$ g; A {
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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();* y/ ]1 ?; B S0 P& ~* z+ w
img.setAttribute('src','index.php?r='+Math.random());
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}
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</script>6 [3 J v- i( h8 b
</html>

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