验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php: g+ I' h9 F r' c6 U; g- e
session_start();
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// 丢弃输出缓冲区的内容 **/ ~8 q2 c" y& ~
ob_clean();7 S) N4 q# P2 [0 c
header ('Content-Type: image/png');
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// 1 创建画布
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$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){
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// $font=6;
// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);: X( \- y9 E8 _3 g
// $string=rand(0, 9);
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// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));, y7 X: a: K+ q& g5 X
// imagestring($image, $font, $x, $y, $string, $color);
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// }
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$code='';
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for($i=0;$i<4;$i++){
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$fontSize=8;
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$x=rand(5,10)+$i*100/4;; d$ O+ d; q- J
$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';, K9 ^3 P' m1 g' `
$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;
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// 3.2 加载自定义字体. I. @, L$ _& K+ ~
$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));, n# `! K3 \8 _# u, D9 K5 N, x7 {
// 把文字填充到画布
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//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);
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$_SESSION['code']=$code;//存储在session里* z. r1 ^, | ?. \) J, B
for($i=0;$i<200;$i++){
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$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), $pointColor);: r% O3 `0 V0 a# P5 a8 Q
}
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for($i=0;$i<2;$i++){4 J# B/ E8 R* I0 n
$linePoint=imagecolorallocate($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), $linePoint);4 C" K5 [& L! |3 S5 q
}
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imagepng($image);
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imagedestroy($image);( W2 P8 o4 m' m) v
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){: `% L, t* [$ L
session_start();/ y8 c' J/ m4 c4 J( G- `& ~
if($_REQUEST['code']==$_SESSION['code']){
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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>";3 S& U) A" o( d+ ]& Z
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}
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?>$ {. j4 p5 j6 U2 v* ~3 i9 t
<!DOCTYPE html>/ l$ t) @/ |9 E. L9 i, Y6 H
<html>
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<head>
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<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">6 O( a+ n/ Y/ ?$ V
a{
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text-decoration:none;% V1 ~6 c. a+ k
font-size:30px;
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color:blue;+ u; Q3 u1 `5 {* z' c" v1 l
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a:hover{% |$ M, H2 t0 R X8 P/ K f
text-decoration:underline;
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}
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</style>
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</head>
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<body>
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<form action="form.php" method="get">2 p2 A" ?8 x& W' P. a8 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 />% P N' \ B& D: K
请输入验证码: <input name="code" /><br />
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<input type="submit" value="提交" />, U$ L1 E9 a: Z+ c `! T$ r
</form>/ q$ b" g2 B4 u0 h6 i
</body>
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<script type="text/javascript">- s& x- l! f& Q+ M+ [8 d
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function changeCode(){" ^4 i. ^0 O, P$ e" q
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());; r1 ^* k! ^9 J4 P" P2 v4 R
}
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</script>
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</html>

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