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admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();/ e0 F+ N5 u! B0 m( h3 J: r. ^
// 丢弃输出缓冲区的内容 **' J1 _9 l) @6 \# Y
ob_clean();
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header ('Content-Type: image/png'); C9 C7 W( F! }5 O3 f
// 1 创建画布
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$image=imagecreatetruecolor(100, 30); A5 s& n' E: ?+ J
// 2 画一个矩形并填充背景颜色为白色6 I% G" E, p( K3 \4 n( d4 M: D' V
$color=imagecolorallocate($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;
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// $y=rand(8, 15);
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// $string=rand(0, 9);
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// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));, N) {4 A. w/ K: v' p
// imagestring($image, $font, $x, $y, $string, $color);
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// }6 _) s5 J' Y# _* E% Q9 J
$code='';
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for($i=0;$i<4;$i++){
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$fontSize=8;$ x K5 t( j6 M$ B& U
$x=rand(5,10)+$i*100/4;% X5 h0 g. I: G& l2 C5 T& w
$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';; _# M) Q/ `5 n5 d/ H7 g
$string=substr($data,rand(0, strlen($data)),1);! q; k# _, Z" ^# I
$code.=$string;! K' ?( T4 { Q r! Q' d
// 3.2 加载自定义字体
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$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
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// 把文字填充到画布. L7 M# ]$ p* b* r' M0 ^! V( ^
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);! F, }! z% e: N7 r6 W; e( c2 g
imagestring($image, $fontSize, $x, $y, $string, $color);8 z1 w! w, t, g j
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$_SESSION['code']=$code;//存储在session里6 z" G" o8 [) @5 l, j4 f. W
for($i=0;$i<200;$i++){, F/ i. y6 k" X7 [! g5 }, ` [& O
$pointColor=imagecolorallocate($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), $linePoint);
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imagepng($image);0 ^8 n1 w; y6 d& ^1 {
imagedestroy($image);
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?>

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form.php

<?php9 V) `" |% H, z, b! c
if(isset($_REQUEST['code'])){
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session_start(); N2 H! Q4 _8 b, b# Q; W$ P
if($_REQUEST['code']==$_SESSION['code']){) V' p) i z6 N, a* ?6 D# T2 |3 h) n
echo "<font color='red'>输入正确</font>";
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}else{8 m2 S# k' e( ? U+ `) e [. T0 ]
echo "<font color='red'>输入错误</font>";% J9 Q+ b& C. i* j0 [! o
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<!DOCTYPE html>3 Z( Z8 B! k: |. H' ?
<html>
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<head>
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<meta chartset="UTF-8" />8 j7 x9 H- ^* u/ Y, n/ }
<style type="text/css" rel="stylesheet">
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text-decoration:none;
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font-size:30px;9 T/ W9 |/ r$ }* X
color:blue;
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a:hover{ @( G2 O# v5 ~) K, k
text-decoration:underline;
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</style> j& _1 |7 m+ ]) N
</head>' Q! V+ Z7 H- u7 W
<body>& E k1 T. f# R% ^$ ?: U. E/ z! E- C
<form action="form.php" method="get">9 X% f+ @" |6 J7 Y- F7 L
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 />; o$ T6 s8 e& M1 r
请输入验证码: <input name="code" /><br />
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<input type="submit" value="提交" />
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</form>7 Y$ g& x7 L9 S: R
</body>
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<script type="text/javascript"># r5 {9 J9 z4 h" [: K
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function changeCode(){
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var img=document.getElementById('img');) X& J4 w) w9 Z, Z7 F. @* P
//img.src='index.php?r='+Math.random();% B) l) ^9 ]% x! D/ w8 R: {
img.setAttribute('src','index.php?r='+Math.random());
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</script>
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</html>

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