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 **- `* ]# l- y2 i* b9 G
ob_clean();
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header ('Content-Type: image/png');1 Y( j3 }: k/ O
// 1 创建画布
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$image=imagecreatetruecolor(100, 30);' C8 d0 y& P0 W4 W0 e1 N; i
// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);0 K: X: `4 M! c' {0 \) [
imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){
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// $font=6;, E$ q9 X3 w( H/ m* k6 p
// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);4 c9 r, \" B) F# J+ P
// $string=rand(0, 9);/ |0 G* X/ I) r/ Q0 l2 E8 O& L
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));: s2 s" t0 o6 X7 t8 Y W/ r
// 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;5 y( I0 v9 A0 E0 r! J" m$ D; y
$x=rand(5,10)+$i*100/4;+ n) [. X ~! z& ^! f* I
$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;
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// 3.2 加载自定义字体8 x9 d! z% O3 | H) m3 q( r
$font_file = '1.ttf';4 H, s2 |0 [) r D* r" f
$color=imagecolorallocate($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, $color);% g1 f) ~- K3 y1 j
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){' g, |* ~$ E+ `3 Y: |& P
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));8 a+ T4 b- o% [3 F& v
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
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}
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));7 B" c: w' W& y% h: [ N$ \
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);& O, \% |7 T- O: Z% M) W
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imagepng($image);
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imagedestroy($image);& ]" n) Q. D7 m$ X0 w
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?>

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form.php

<?php' H6 `; u9 [% x3 F( t) o x& J
if(isset($_REQUEST['code'])){0 x7 ^& }+ @8 i3 x# n
session_start();% i* x, \2 E( C( P8 ?0 s+ B+ B
if($_REQUEST['code']==$_SESSION['code']){* U B" |3 `: U7 G8 Q. h y
echo "<font color='red'>输入正确</font>";
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}else{' b% I; D2 K& a! e
echo "<font color='red'>输入错误</font>";7 |% F( }' d, C" V
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}
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?>
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<!DOCTYPE html>
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<html>
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<head>5 t% W7 [* T( r5 @ l9 |& `# B
<meta chartset="UTF-8" />. Y$ }; X: r* a# {# N
<style type="text/css" rel="stylesheet">- P- _8 T: u- V6 l
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text-decoration:none;
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font-size:30px;) J3 Q6 |( G% U1 R
color:blue;
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}
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a:hover{0 h. A7 h8 ~( Q ^: r1 ?# [$ @" E
text-decoration:underline;
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</style>
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</head>
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<body> B9 P& D( Q* n; e, a4 I
<form action="form.php" method="get">! c& A$ `$ y' a
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>+ u$ P& k2 u: k0 ?
<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" />
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</form>
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</body>
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<script type="text/javascript">
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function changeCode(){8 T( w. x% I4 J( K
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());1 |& d5 Y5 {) P& h7 h: D: W
}
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</script>- f& \' C$ t. x/ T0 l5 R& b7 Q
</html>

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