验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php/ \9 ?7 d P9 F# \
session_start();9 R$ d, d1 t7 O, S" \; `" ^
// 丢弃输出缓冲区的内容 **
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ob_clean();: T) l8 G# _$ x# p
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! c) K d- j L7 ~
$color=imagecolorallocate($image, 255, 255, 255);2 r+ Z' I: n6 Y1 ^" O
imagefill($image, 20, 20, $color);8 f$ v, `# s8 f0 y9 L* }2 h
// for($i=0;$i<4;$i++){9 ]& v% |0 [+ a( \4 B
// $font=6;
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// $x=rand(5,10)+$i*100/4;5 J- s Q2 Y3 F
// $y=rand(8, 15);' L( I2 n( ]3 `0 p/ |) 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, $color);5 u w# F4 D7 l( H3 }. }
// }
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$code='';8 n1 e( Q6 w' n9 h
for($i=0;$i<4;$i++){
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$fontSize=8;
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$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);4 E7 v! Z2 h1 V% M3 q
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$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
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$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));/ F0 f/ @/ N6 K# M
// 把文字填充到画布
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//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){) h/ T6 B U& Z9 D
$pointColor=imagecolorallocate($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++){( B4 \ q$ j( Y# X' @" k; o4 z
$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));; i# A6 x- B# G2 U2 |6 s, B
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint); R4 G' I$ t! L( ` s0 ~
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imagepng($image);
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imagedestroy($image);
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?>

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form.php

<?php+ _9 K" Q3 O, {$ P$ g$ [
if(isset($_REQUEST['code'])){ C+ L# Z0 d! M9 V
session_start();
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if($_REQUEST['code']==$_SESSION['code']){7 f: M, j) X6 b+ y+ J* k% V" F' R
echo "<font color='red'>输入正确</font>";
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}else{
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echo "<font color='red'>输入错误</font>";
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}
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}
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?>
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<!DOCTYPE html>4 L7 n. c% U) \5 [
<html>4 {7 s+ _2 e0 g# S% o, B: S2 ^. Z
<head>+ j9 }7 y1 e7 u& K* x# M4 a8 c# P
<meta chartset="UTF-8" />8 M: \8 h/ B" [- O
<style type="text/css" rel="stylesheet">
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a{
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text-decoration:none;
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font-size:30px;$ I/ l. X5 g Z2 G* _
color:blue;0 x( [# ]/ j* r5 S
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a:hover{
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text-decoration:underline;
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</style>
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</head>
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<body>5 L& n$ G" } B1 l
<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 />( Y" g6 y+ Y, w8 r, P( a2 z
请输入验证码: <input name="code" /><br />3 s W4 a5 y+ q- n2 h6 F- I' U, ~+ f
<input type="submit" value="提交" />4 J; \) I( U) a: y, V& C
</form>1 Q4 I3 o1 U6 L6 Y5 c& `% u
</body>
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<script type="text/javascript">' v( K- c1 w, z! ?0 `' d3 E
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function changeCode(){
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var img=document.getElementById('img');1 o) V/ c H( W6 F* G6 v [
//img.src='index.php?r='+Math.random();+ v6 t* D2 \3 K/ p
img.setAttribute('src','index.php?r='+Math.random());
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</script>
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</html>

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