验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php9 c5 C2 Q/ ? \
session_start();6 D, k2 }! V5 N: K* ~1 e6 E
// 丢弃输出缓冲区的内容 **
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ob_clean();. _& _6 d% W; C( N
header ('Content-Type: image/png');7 _$ N& m$ r; V% t! {- ^& K. F. I
// 1 创建画布$ l1 `1 m+ E. L
$image=imagecreatetruecolor(100, 30);2 q5 M, Y% M5 ^( a
// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);% ]! T ]1 s) z4 b
// for($i=0;$i<4;$i++){) o; b, v% s- q
// $font=6;
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// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);
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// $string=rand(0, 9);0 S- X* w8 @0 c, ^1 z1 {' Z
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);, |6 `/ a1 Q' ~: ]& x& U7 c
// } y: C+ b0 e4 g) e
$code='';
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for($i=0;$i<4;$i++){* f- {* {7 O+ F
$fontSize=8;! x; [# W0 m, g6 R$ h
$x=rand(5,10)+$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.=$string;. K n6 q3 Q' K, M) }' S: v* j$ F
// 3.2 加载自定义字体
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$font_file = '1.ttf';& c' {6 W) P2 N* Q p# a6 a7 z
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
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// 把文字填充到画布 O, O7 ?4 y+ ]) C
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);4 h9 G" ? q$ s
imagestring($image, $fontSize, $x, $y, $string, $color);
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}
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){! E! G1 i! M0 I: E) U
$pointColor=imagecolorallocate($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++){
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$linePoint=imagecolorallocate($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), $linePoint);6 s. i- a4 b; V3 ~! @* y# k& a
}
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imagepng($image);; b' P' ]7 G) q2 r
imagedestroy($image);
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?>

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form.php

<?php& g( l, }, O8 ?* _8 A5 u' r8 z1 S2 |
if(isset($_REQUEST['code'])){1 h- i) k% J: ^" n% d
session_start();
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if($_REQUEST['code']==$_SESSION['code']){9 f& r* ]9 \9 ^
echo "<font color='red'>输入正确</font>";
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}else{) l' i" v1 p7 T% {1 t# n
echo "<font color='red'>输入错误</font>";' s9 t4 Q; U k0 K; L& ^
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?>% x# A. P$ F$ ?4 g" _/ B! ]1 _
<!DOCTYPE html>! P: f, H9 A8 X+ _9 M- G
<html>
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<head>/ g4 o5 x, s' i/ t! m7 o
<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">
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a{
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text-decoration:none;
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font-size:30px;: X+ ~& f3 W& \6 w' b/ W4 L+ ~& Y
color:blue;
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}
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a:hover{! T, j+ p& Y0 C- {5 L! \
text-decoration:underline;
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}
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</style>
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</head>
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<body>9 y; N: y2 _7 P& n3 v& @
<form action="form.php" method="get">9 K% n- F! Q6 k5 T
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>5 h& Z% S4 Y P1 k" M9 z4 a( z0 t
<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 />
<input type="submit" value="提交" />
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</form>- S: m6 Y+ d' \) v6 B5 |3 u7 d0 A
</body>
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<script type="text/javascript">
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function changeCode(){
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var img=document.getElementById('img');' y( D. b8 E* X2 J# X4 _- Y0 s7 V
//img.src='index.php?r='+Math.random();, z& i0 g- R; j0 a2 G
img.setAttribute('src','index.php?r='+Math.random());- H. j1 ]# |9 R5 {, T( N, M
}
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</script>
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</html>

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