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admin · 发表于 2018-12-16 01:00:13

index.php

<?php5 T" D+ k7 b3 V) k) E! J8 w0 H4 x; ~! F
session_start();& D+ T; t' P. F8 A: P0 `2 S
// 丢弃输出缓冲区的内容 **
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ob_clean();0 \: i/ z% e+ T" n1 W9 K2 O
header ('Content-Type: image/png');
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// 1 创建画布5 W4 b8 B* G. W) H
$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色; ^+ |7 `9 G8 c- i6 k9 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++){1 a4 }+ u% B; I
// $font=6;
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// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);" c1 D4 ?% W1 z: ]2 C4 S0 @9 N
// $string=rand(0, 9);9 F( ]5 z% G% k" F3 a
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);& i% e- r9 W; x
// }
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$code='';
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for($i=0;$i<4;$i++){" T2 k7 f7 W) }8 Y& \" t
$fontSize=8;
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$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;
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// 3.2 加载自定义字体, s; v) _- ]% p) v5 W
$font_file = '1.ttf';3 W0 W3 _; t H9 b( x& g" R) K& \
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
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// 把文字填充到画布" Y( Y) s5 D% q" W; |4 J0 |- p
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);4 ` u: `8 l- \& Z7 F+ m
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$_SESSION['code']=$code;//存储在session里0 P$ l9 k7 \( |+ s0 c8 a
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), $pointColor);
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} }% Q8 b8 V: E6 | G6 r5 `4 p! ~0 j
for($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), $linePoint);) [+ R3 g: ^/ ?5 ~5 a
}
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imagepng($image);6 L/ M' c; Y* ~
imagedestroy($image);0 m" E6 h6 k9 Z# u: p) e
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?>

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form.php

<?php5 a5 L, Z1 R: h! N5 z$ {, @ |0 X8 {
if(isset($_REQUEST['code'])){
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session_start();
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if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";
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}else{
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echo "<font color='red'>输入错误</font>";7 [5 W/ S; C0 J$ p8 s, J
}
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?>
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<!DOCTYPE html>$ L" T0 ^) J/ ^9 R# l. A
<html>
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<head>
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<meta chartset="UTF-8" />2 @/ A1 c1 @- g' d" ~
<style type="text/css" rel="stylesheet">
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text-decoration:none;
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font-size:30px;
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color:blue;
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a:hover{
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text-decoration:underline;
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}
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</style>
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</head>0 c$ |, D2 W( T( i: H
<body> R- Z ~/ E9 ~, `6 r! h( d
<form action="form.php" method="get">2 s8 q( \) j2 q# L5 M
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 />
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请输入验证码: <input name="code" /><br />* C! Q$ f* O1 n; {7 J
<input type="submit" value="提交" />) W( L5 b0 M( J7 D. _: v( p6 N* l. Z
</form>+ g- g' C, S4 t# V- n- T5 q. P
</body>
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<script type="text/javascript">
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function changeCode(){. T7 A, v& a2 ]! {* }4 n7 }
var img=document.getElementById('img');5 v$ P. K6 F; p
//img.src='index.php?r='+Math.random();$ U i [6 m* }% V+ O- [4 E4 R
img.setAttribute('src','index.php?r='+Math.random());5 C; N, M B, }: F5 {" y3 D
}
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</script>
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</html>

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