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admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();' Q, ?, P7 i) ]0 A
// 丢弃输出缓冲区的内容 **
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ob_clean();% `( ^& |5 v, h+ I* Q8 |
header ('Content-Type: image/png');
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// 1 创建画布
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$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色5 l+ k2 F0 t2 Y' U# g& P
$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){ ?) c' B/ Y) M! }: `: x
// $font=6;5 ?; T: C8 A. s; h& @# @
// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);2 W7 Q5 b% M) D6 J9 Q
// $string=rand(0, 9);
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// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);5 G; O- K N* ~8 s, H1 v6 B
// }0 B- |8 u+ G4 O [
$code='';
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for($i=0;$i<4;$i++){- ^' s+ r3 P" i" v% I
$fontSize=8;
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$x=rand(5,10)+$i*100/4;0 j& R( H; m6 u9 `
$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);% P; j9 e6 V) j$ w0 ]
$code.=$string;1 G: F: N1 L# m* }6 D4 B. F5 g
// 3.2 加载自定义字体( H$ l9 P0 N/ L
$font_file = '1.ttf';5 w7 C" a& D% I! l
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
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// 把文字填充到画布1 K/ l* p3 a* W! Y9 h
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);
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}; M3 C$ R8 L4 x j2 T. L* m& r
$_SESSION['code']=$code;//存储在session里
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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), $pointColor);# n1 t7 [4 W1 I1 c6 x6 O
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for($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), $linePoint);
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}
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imagepng($image);3 `* f9 O( U1 H: i- O
imagedestroy($image);
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?>

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form.php

<?php& F+ x* ~1 f/ I6 N+ R X& X" U Z
if(isset($_REQUEST['code'])){* m# q6 q7 F" H/ c9 w
session_start();
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if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";: b6 \7 X# B$ B* L+ p7 B
}else{; E/ P* M5 Z6 T0 O! \0 }# o
echo "<font color='red'>输入错误</font>";
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?>
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<!DOCTYPE html>1 p+ R% m6 \1 J+ [( r
<html>9 E- y& `5 t, y4 ^- `! W
<head>0 c; B* q0 @+ N' }
<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">0 N6 {9 i2 V9 c& m% a, u" k
a{
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text-decoration:none;
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font-size:30px;
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color:blue;5 Q" h( f. q( H2 G% U
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a:hover{3 A3 m4 C3 L9 {8 X. |0 G0 \2 `5 G
text-decoration:underline;
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</style>
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</head>
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<body>" v. \( h) O7 M
<form action="form.php" method="get">2 d/ _% o2 O$ i+ r, M/ r
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>' E; m. s0 |: r& k. v
<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 />/ A A+ x, ^/ g0 {* O& m
<input type="submit" value="提交" />
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</form>( j& v' p+ B; b0 a* L
</body>' C! r$ D$ a! T! y& K s
<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();
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img.setAttribute('src','index.php?r='+Math.random());1 p1 y8 n9 d) `' f0 x
}
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</script>
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</html>

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