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 **" }! h( U+ e5 N7 X) C" G) B0 j
ob_clean();, y/ Q" c2 k# `' b# E4 i7 Q
header ('Content-Type: image/png');
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// 1 创建画布! l; N1 y4 U, ~# c
$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){
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// $font=6;
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// $x=rand(5,10)+$i*100/4; i0 A) ]6 r# r6 H9 g4 o: ?( G
// $y=rand(8, 15);& r! H& f/ t2 s: R7 u2 O2 Z
// $string=rand(0, 9);3 W# B) D2 W/ K: h+ ]0 n/ S
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));4 G- T; ]' q9 c( \
// imagestring($image, $font, $x, $y, $string, $color);
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// }
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$code='';) E! b5 S/ O- A/ i# D
for($i=0;$i<4;$i++){' E1 G& K, x0 u/ x) U6 w- }( G
$fontSize=8;" K) y. w. {1 D6 R6 \/ @
$x=rand(5,10)+$i*100/4;. Y/ x5 b+ i" a( E
$y=rand(5, 15);, N5 v) g- `$ K% B# M
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';) D6 D) |" A* n( s
$string=substr($data,rand(0, strlen($data)),1); i7 o3 C1 _& L$ Y+ o \1 O" T+ O
$code.=$string;! _; N% ~* d( Z2 T
// 3.2 加载自定义字体$ c# a1 n L4 \4 P# `( h
$font_file = '1.ttf';8 Y1 K$ s; e% {! Q+ 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, $string);# F: R" T$ G3 Y2 i5 }* c. K
imagestring($image, $fontSize, $x, $y, $string, $color);
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}
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$_SESSION['code']=$code;//存储在session里6 t, C% l: E( U4 ?2 _ R+ d/ O
for($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), $pointColor);3 x4 c/ H1 D! J
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for($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), $linePoint);0 N* G/ v2 j: b7 ~5 h
}
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imagepng($image);6 \ ~+ K- g! C5 a9 w
imagedestroy($image);
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?>

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form.php

<?php2 N# P- z; b& n6 i" m! R6 ]" d* j
if(isset($_REQUEST['code'])){ L* j" b' G: @( B
session_start();
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if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";+ T; C7 p. W* i+ v7 {0 I8 V
}else{, c: M* a: P; f3 C& }$ C' c7 G
echo "<font color='red'>输入错误</font>";0 e2 _$ [$ ?5 u# \1 W
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}
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?>% {, r6 f9 y8 J6 y# p6 Y* W3 Y+ c
<!DOCTYPE html>1 z; a6 m n" Y: X' p7 {5 e
<html>
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<head>
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<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;1 u5 C' j8 a) H0 N/ A) w
font-size:30px;
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color:blue;
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}
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a:hover{% b* v m" m; h: w. y
text-decoration:underline;
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</style>' A* d/ [8 M9 D
</head>
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<body>- \+ a V Q7 X3 r4 k2 h" Q
<form action="form.php" method="get">
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验证码: <img id="img" src="index.php?" onclick="changeCode()"/>9 A) F/ e# v! T4 E
<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 />2 w7 C3 Q& ^% }
<input type="submit" value="提交" />) Y& W$ S' W* R$ b: O
</form>
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</body>0 [* x U5 h6 X5 i1 ]7 D& I3 ^3 V" v
<script type="text/javascript">
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function changeCode(){
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var img=document.getElementById('img');7 u: ]9 I4 g4 W% c7 c
//img.src='index.php?r='+Math.random();
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img.setAttribute('src','index.php?r='+Math.random());* J- n) B1 R3 K, ~* c
}
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</script>6 Z7 T- ]7 @4 H2 W6 Y
</html>

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