验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php1 J; g' s: q8 n8 U
session_start();: C, _" l- l, U& ~* U: l
// 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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$image=imagecreatetruecolor(100, 30);, b; w4 C* z/ P4 s8 M
// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);) q2 E; U6 W; o% B
imagefill($image, 20, 20, $color);0 Q* V5 A4 H$ R$ J, @9 l7 ^4 n/ A+ ^
// for($i=0;$i<4;$i++){
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// $font=6;: s& u4 o- |& A6 C6 G
// $x=rand(5,10)+$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));
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// imagestring($image, $font, $x, $y, $string, $color);! X. [/ e7 r7 a
// }$ ?5 M" N: z8 L: P" ?5 I
$code='';+ X* F9 q9 O; ?
for($i=0;$i<4;$i++){
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$fontSize=8;1 A5 X" |6 U- @# B
$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);( r6 @3 S, Z. @
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);
$code.=$string;
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// 3.2 加载自定义字体+ Z# A5 B" w$ Z! h' b2 j% H
$font_file = '1.ttf';, e. g/ z3 Z+ X7 T8 p5 ~0 A5 j5 L; V
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));. B9 G. T5 X+ K( q7 [
// 把文字填充到画布
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//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);0 k( |6 o! T n4 S* u
imagestring($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));9 d. T+ e, @1 j$ N4 v8 Q
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
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}
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for($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);1 U% N& m) x, M9 P
imagedestroy($image);
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){
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session_start();
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if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";
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}else{
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echo "<font color='red'>输入错误</font>";
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}
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?>
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<!DOCTYPE html>7 O1 ~7 d" e. j( Z$ X- n$ z
<html>
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<head>8 @! i, I: s" j2 x( @' O6 i3 B
<meta chartset="UTF-8" />: I0 t; W" e9 O5 ?
<style type="text/css" rel="stylesheet">8 K! c- ~* y0 V" [+ d: f
a{
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text-decoration:none;; ]( f3 {' q4 `5 Z/ K
font-size:30px;
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color:blue;3 l3 a" G: V4 N7 t% l4 Z# P1 a
}
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a:hover{
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text-decoration:underline;6 O( Z) N4 M$ Z6 ]. j
}
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</style>& i) }4 G# S* {+ o# b6 ] ^
</head>
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<body>7 _: G' e1 z) j2 _) s5 V# d8 r a
<form action="form.php" method="get">; N3 i5 k3 s' T. u6 G
验证码: <img id="img" src="index.php?" onclick="changeCode()"/># ~, L8 ?: g, e* }/ T
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />4 S5 m% ~. `/ R
请输入验证码: <input name="code" /><br />
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<input type="submit" value="提交" />" G, A' p7 f+ u8 i
</form>
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</body>
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<script type="text/javascript">
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function changeCode(){- L6 O9 S& E* B$ J* }; Y p% D2 z
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());, C3 c2 z7 E& ~
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</script>
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</html>

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