验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php6 C. N* v( b( Y+ m9 P# Z
session_start();
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// 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');
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// 1 创建画布
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$image=imagecreatetruecolor(100, 30);7 @" i% h- c; x' O8 Y
// 2 画一个矩形并填充背景颜色为白色3 W" K" X& N9 C
$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){" R3 Z# w- `3 B
// $font=6;! M/ j5 V. [2 v4 g
// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);
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// $string=rand(0, 9);" o S5 u% W2 y. P0 D
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));! `; ^, w" F. d- Y' ?
// imagestring($image, $font, $x, $y, $string, $color);
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// }
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$code='';7 ]4 \9 O( u* G4 z" s- O# j
for($i=0;$i<4;$i++){+ }4 |) K) v; E: x
$fontSize=8;
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$x=rand(5,10)+$i*100/4;/ A$ J% ]. R. ]' [, r% Y
$y=rand(5, 15);
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$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1 ^' ?7 @4 i8 u2 Q7 D# [2 z; L B
$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
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// 把文字填充到画布$ ]0 M9 x9 \$ e4 H
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);, \8 P% S" E6 t! {& z
}
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){, U# f! z+ T; I$ \2 K1 s7 l
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));
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imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);; b4 w; V& b% x3 B
}
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));0 b/ b; R- Q% _% j
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);* y( q1 D3 k0 B
}
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imagepng($image);% i# G2 j3 ?8 v o1 Z5 }: _" I
imagedestroy($image);7 X# w1 f% {6 I, ^: B
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?>

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form.php

<?php0 L, N) h- Q* {$ l' ^6 E
if(isset($_REQUEST['code'])){3 P% V5 \3 a; l X
session_start();" G2 e4 _* g5 E/ J; b" C3 m
if($_REQUEST['code']==$_SESSION['code']){' N1 | M6 U( @$ A
echo "<font color='red'>输入正确</font>";' j/ h [. k+ k% ?$ e
}else{- s1 [6 v9 Y5 l" I
echo "<font color='red'>输入错误</font>";9 O- E" G, x2 J" d; B
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}
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?>! t- a; ~2 A& t7 ~; I
<!DOCTYPE html>' k* |5 {( b9 ]4 @7 Q/ i
<html>5 [& O0 _5 G" ^2 U5 \
<head>
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<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">0 N* N U1 D8 X! j
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{' E, [/ R. l' j6 i5 u
text-decoration:underline;
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</style>/ G0 C# _, S8 z2 [
</head> U1 y% X+ i" x5 R
<body>$ g! b4 M; T5 O. |' ~1 B, c7 z* B& p
<form action="form.php" method="get">
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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 />
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请输入验证码: <input name="code" /><br />7 ^8 E/ c! G2 V2 ~% N9 ^5 j
<input type="submit" value="提交" />2 u( q, B6 v9 N( i3 ]$ k
</form>0 f2 z5 ~2 J0 W
</body>; A3 {1 n: M8 y$ q- F8 f% q& c
<script type="text/javascript">
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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();9 `4 {/ W0 o2 i2 L" e
img.setAttribute('src','index.php?r='+Math.random());8 @- Y) r# L3 P7 i s
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</script>
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</html>

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