验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php# P9 P9 v0 h3 S+ d
session_start();/ y c' V* N$ U* H9 p3 }
// 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');& Z n _# @$ e: t: ?: A* }
// 1 创建画布* v' x/ E. E) ?: Z
$image=imagecreatetruecolor(100, 30);! Y8 N9 n0 q+ S l! i
// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);% R6 y7 F- o! U t
imagefill($image, 20, 20, $color);, j/ L' e3 ~8 N( r) g. V& A f
// for($i=0;$i<4;$i++){8 p' u; ]& @! E* t8 |! p7 D
// $font=6;
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// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);. i+ Y& m$ X4 v( `
// $string=rand(0, 9);% Z* O+ c- q# f1 z) L: B
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));/ j1 |3 b; x2 z( P( B" G
// imagestring($image, $font, $x, $y, $string, $color);$ \) \6 Q! L6 Z9 c9 }* D- s% i
// }
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$code='';8 P; ]9 j }2 Z( s4 e
for($i=0;$i<4;$i++){% @& e5 a% o m: `! y7 z! R4 m' t
$fontSize=8;: Z' U& A+ ^$ I- u% g
$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);* O/ L6 H! |4 j4 c
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);, W, `5 R0 J& n' p
$code.=$string;
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// 3.2 加载自定义字体
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$font_file = '1.ttf';
# R2 c, y8 t5 w1 [0 I& M
$color=imagecolorallocate($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);
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}
# R, d y/ J2 `9 d0 p; d- m* u
$_SESSION['code']=$code;//存储在session里8 y8 N- T% G1 T4 Y. Q/ D! |# R2 Q
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), $pointColor);
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}
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for($i=0;$i<2;$i++){$ Z+ _' p/ K' E7 C
$linePoint=imagecolorallocate($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), $linePoint);# D7 r2 {- u8 e' Q7 B; }; T
}
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imagepng($image);
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imagedestroy($image);
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?>

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form.php

<?php1 c0 t" w3 B$ K8 F# o% {2 [; q" G- v
if(isset($_REQUEST['code'])){# x' x/ k6 x+ m/ m2 }' q2 ]
session_start();
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if($_REQUEST['code']==$_SESSION['code']){. ^9 g9 H, E" Z2 R! ?
echo "<font color='red'>输入正确</font>";
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}else{2 q" U5 \" b' r# j( Q
echo "<font color='red'>输入错误</font>";
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}
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}
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?>
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<!DOCTYPE html>- B5 {- l9 }5 u0 U
<html>: k: @" S" R: c! h5 u$ J: [7 A
<head>
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<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">1 h! ~; |+ l5 o7 Y7 A
a{
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text-decoration:none;
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font-size:30px;
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color:blue;
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a:hover{
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text-decoration:underline;, A$ K1 m1 s# w
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</style>8 }3 C+ d. U" b
</head>% ]/ W( b; Q; k4 k
<body>. \9 R+ `) l6 r% u$ I3 R' b- O
<form action="form.php" method="get">, _+ i+ q3 r5 M: m; P
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>* @3 E- e4 D" G- H. W# H
<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" />6 Y/ y4 m1 I2 T4 Z
</form>
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</body>( [ f, C; j1 u8 F2 Z! E
<script type="text/javascript">! V) F: t2 G. \# [- E" e, r: X
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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();& }0 q( b# x! W
img.setAttribute('src','index.php?r='+Math.random());
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}; L9 Q# v5 |; t& F8 |
</script>5 M; M/ D0 F/ Q: L* B
</html>

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