验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php, P3 |/ t& h! v
session_start(); J5 r! g+ }& I. w1 L
// 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');! H- m8 s. z0 ^9 c
// 1 创建画布8 O; o3 A9 N! ?: Q7 x6 D' `) j7 l% A
$image=imagecreatetruecolor(100, 30);8 m( s% M1 H& z: e) w3 q
// 2 画一个矩形并填充背景颜色为白色- B% `- ^# W3 g1 }9 a
$color=imagecolorallocate($image, 255, 255, 255);( i/ K8 o; r0 z
imagefill($image, 20, 20, $color);- i3 w+ B z% ~9 M
// for($i=0;$i<4;$i++){ R) C8 b# n/ G5 f& o4 n6 j
// $font=6;8 [ c' b/ ?, f* p% K
// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);! E8 f7 O) F# R& v4 Y/ Q
// $string=rand(0, 9);
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// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));" H; w& @% M" W
// imagestring($image, $font, $x, $y, $string, $color);6 _" j7 k0 o, t4 u) v/ o" q0 W! o
// }
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$code='';
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for($i=0;$i<4;$i++){4 w) X$ ~7 G. ^. k' [( u
$fontSize=8;
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$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;. ]4 k+ | F3 r) B7 ^
// 3.2 加载自定义字体
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$font_file = '1.ttf';! }% W0 W' T: k0 D( [, U. u
$color=imagecolorallocate($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, $string);8 f5 ?" X6 D5 J1 h7 c5 s! i3 Q8 v
imagestring($image, $fontSize, $x, $y, $string, $color);
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$_SESSION['code']=$code;//存储在session里4 ~0 {1 b1 G6 q! q: t- g* ]
for($i=0;$i<200;$i++){
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$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));. t4 z: e- w8 _) t7 D/ Q" _
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));8 A! Y( q7 Z9 N/ M* p% f
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);
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imagepng($image);2 h0 W# h! A6 I& U# k: D7 _
imagedestroy($image);2 c2 J- v9 \7 U/ y
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?>

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form.php

<?php; h P9 Y" R& A9 v8 v% D/ M1 H) e5 l: ]
if(isset($_REQUEST['code'])){
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session_start(); P2 O k8 ~" J) t. @5 [
if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";
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}else{" u" d) R f* b
echo "<font color='red'>输入错误</font>";6 ?5 Z1 x/ I5 u3 m1 `) s
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?>
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<!DOCTYPE html>- Z: E7 {! Q0 K3 d- W8 H& Z0 ]3 ~' M
<html>3 g( ]; z# F+ D+ l
<head>) K" ] t- c' s: b8 m
<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">' u( n: m8 `; w1 a2 r
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text-decoration:none;- i% \! o0 h' B4 o+ W; b' Y, K
font-size:30px;( r: p& X: {/ A* |( m
color:blue;1 t6 ^7 _/ s3 H" M$ L( e$ o
}
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a:hover{; w: T( [. |9 ^' q; G
text-decoration:underline;: E% [1 j! q; Y4 v
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</style>- j0 G1 [ \& U% I
</head>
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<body>
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<form action="form.php" method="get">
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>- \# I& Z; M- W- R2 j9 g
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />8 G4 b( C' o8 {' q8 m7 P
请输入验证码: <input name="code" /><br />
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<input type="submit" value="提交" />2 i- @) c2 \' a0 u6 a- [: [
</form># @: j! t0 Z7 s. }* l4 i
</body>$ G/ o! D& [& |0 P) Q# V7 J
<script type="text/javascript">
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function changeCode(){
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var img=document.getElementById('img');% c* T& v' x( s6 w3 ~
//img.src='index.php?r='+Math.random();
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img.setAttribute('src','index.php?r='+Math.random());
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}
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</script>( `1 p2 w# @: A; J5 V
</html>

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