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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 **
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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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$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);6 K* D P ]( }5 v3 U: c. n- R
imagefill($image, 20, 20, $color);! w8 m) X6 l* {. z0 ^1 x
// for($i=0;$i<4;$i++){
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// $font=6;
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// $x=rand(5,10)+$i*100/4;: E5 L# Y6 D1 T4 e* g6 x
// $y=rand(8, 15);
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// $string=rand(0, 9);/ s5 o# l! H8 w* f
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);5 ~3 v5 \/ b5 S: q1 D' [
// }
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$code='';8 K/ i! w5 T/ O# X, F
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$fontSize=8;0 X4 |8 c: v8 x" \' I
$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';9 v8 t6 H" S3 ]! |' x) J- c6 E1 k
$string=substr($data,rand(0, strlen($data)),1);1 V8 i" S1 n! ]% k8 }
$code.=$string;
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// 3.2 加载自定义字体/ H3 F& J( ?7 _
$font_file = '1.ttf';; K; ]0 R9 H6 F. l' g# \
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));) H) a+ y$ H g" |. y6 h3 Z
// 把文字填充到画布
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//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);. f% I2 P W' |
imagestring($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++){
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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++){* m3 q L5 g; ]9 j- S# N" C. n* S
$linePoint=imagecolorallocate($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);$ t0 ~8 n/ `3 Y4 F& p7 E6 j1 M
imagedestroy($image);
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){+ v, p c% M1 P
session_start();0 ?; ?+ i4 M: |7 v2 l4 [& h
if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";) N4 l- Z7 B( B) @6 M
}else{
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echo "<font color='red'>输入错误</font>";9 o7 A" B- z, b# S; m+ Z9 f
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?>
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<!DOCTYPE html>
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<html>" b: U+ V% s. `5 g6 T5 H
<head>6 @2 u/ e" d# W
<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">4 Q; {, D2 K$ B" |
a{
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text-decoration:none;
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font-size:30px;
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color:blue;% O% d5 [- F( @+ C7 q
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a:hover{" b9 m% ~4 F# U& a
text-decoration:underline;
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</style>: C, v0 R2 |3 S8 J* _
</head>4 s9 w8 J* n0 O6 C8 f
<body>
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<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 />8 z. `" T- j: |9 C" N
请输入验证码: <input name="code" /><br />
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<input type="submit" value="提交" /> D3 _5 G4 v$ D ?& M% v
</form>5 h& X% @2 f7 `4 G
</body>; S% e! V' }; D7 K( r3 ^
<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();1 Z$ o1 e% }# C
img.setAttribute('src','index.php?r='+Math.random());
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}
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</script>
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</html>

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