验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();) T8 H( K3 y% _: N1 }7 s" K
// 丢弃输出缓冲区的内容 **
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ob_clean();. t4 }( ?; G \, D* \; s" H
header ('Content-Type: image/png');* J w. N& [3 t. B
// 1 创建画布; X- n, z7 O5 |8 N
$image=imagecreatetruecolor(100, 30);9 }& V. o z' U+ n7 ~% m
// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);2 ~" y* K/ B" m2 [1 d3 a' Y
// for($i=0;$i<4;$i++){
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// $font=6;0 W8 v+ Q2 L; O: B" e
// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);& v5 m, }- W6 E3 Y4 e) y/ I6 E
// $string=rand(0, 9);2 U8 v$ u+ x; T4 f5 B* X. j
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));, ^" h5 U7 r% E
// imagestring($image, $font, $x, $y, $string, $color);5 P2 V% w4 Y( L: t. A+ Y) g
// }0 r9 j2 Z" D, x* B* K, z' x
$code='';" a% j0 Q# _0 ]2 D
for($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);4 c- q7 x- l! s( N
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);' }% K6 V6 s) c9 S/ Y2 u
$code.=$string;
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// 3.2 加载自定义字体
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$font_file = '1.ttf'; V" Q7 h5 J$ ?# ]
$color=imagecolorallocate($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, $color);: g- k" M, P$ ]8 a* G6 V* S; j
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$_SESSION['code']=$code;//存储在session里( b& k1 |, f ~- {
for($i=0;$i<200;$i++){* E6 X; c x) 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), $pointColor);
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for($i=0;$i<2;$i++){6 f- ~& f3 d0 y4 t; A
$linePoint=imagecolorallocate($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), $linePoint);# v- d1 Q! u2 m8 s! ?
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imagepng($image);
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imagedestroy($image);" l2 j1 j3 [0 f
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){
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session_start();
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if($_REQUEST['code']==$_SESSION['code']){- ?5 Y5 N3 v9 |, D! I+ v1 t
echo "<font color='red'>输入正确</font>";
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}else{
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echo "<font color='red'>输入错误</font>";. a0 n0 u1 H5 f# P/ I8 d% S6 l! M
}
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}) |) t+ T+ X1 c- a
?>6 E- Q/ S* H; H" l# n, G6 ?
<!DOCTYPE html> R& g" d' _- o& {$ Y" k
<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;
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font-size:30px;. Q. I0 `" D0 D, O) {
color:blue;; {7 c* k# V& ~. r2 i2 @5 \5 W
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a:hover{
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text-decoration:underline;1 ?0 Z3 m# M; U2 p* N
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</style>
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</head>8 c3 S L! U7 g. R0 w/ M$ [
<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()"/>7 W2 v7 r2 e( @4 ~8 B
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />2 I' S- n1 Q/ k; d% g; l
请输入验证码: <input name="code" /><br />
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<input type="submit" value="提交" />7 ]( l( p+ v* x' W6 G
</form>
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</body>, ~0 G. o3 c' @2 S+ J# k9 o, [6 |* z m
<script type="text/javascript">
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function changeCode(){
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var img=document.getElementById('img');( {2 I0 ?- p% p ~
//img.src='index.php?r='+Math.random();$ c, n9 ^& s& I8 ]0 S+ e" _
img.setAttribute('src','index.php?r='+Math.random());" o- P& K% d5 g. v- R+ ^
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</script>
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</html>

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