验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();2 n7 }5 `" M) u; ?$ t: \* q
// 丢弃输出缓冲区的内容 **6 `$ Z1 F9 E( y& n. J
ob_clean();* T u K# p, k* Y$ 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: \1 k0 \) H: U; G4 v
$color=imagecolorallocate($image, 255, 255, 255);& H6 l% S/ P" h8 e0 q3 |( E& i
imagefill($image, 20, 20, $color);* H2 Z$ w9 m; R
// 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);6 ^) H; P, g1 a9 b: c; P
// $string=rand(0, 9);
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// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));0 [: T4 @. _3 x, M
// imagestring($image, $font, $x, $y, $string, $color);- r* e- S0 I& [7 p0 Z
// } p& a& r0 u P" U$ A7 T
$code='';
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for($i=0;$i<4;$i++){5 |; \: a' m' ?
$fontSize=8;& f: d( C4 I) S- F& B. g' d
$x=rand(5,10)+$i*100/4; ~: S# ^; C5 w0 P
$y=rand(5, 15);; x. q; l8 I% H0 o3 g! E
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);/ I$ r/ h1 y2 J# ~4 N% S- z+ B$ i
$code.=$string;! l. E# |1 j, f" F
// 3.2 加载自定义字体
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$font_file = '1.ttf';& P P7 L+ P9 [/ \
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));+ ] T4 ~- f6 o; a/ t: U
// 把文字填充到画布
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//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);1 |- ]) @- {! D3 X
imagestring($image, $fontSize, $x, $y, $string, $color);9 v& D: m1 C: f/ {; C
}
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){2 E; R2 u! s( |
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));7 r: Q" d5 d" e
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);8 A6 C' p/ d/ R- C" ]2 ^/ n0 ?5 Q) _. J
}
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));$ C. p' ^$ O2 G5 j9 s* q& S' {
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);1 t* p1 {0 _# G* A% l. B/ y) \
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imagepng($image);
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imagedestroy($image);
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){; ~& B! d' Z( J$ m8 L
session_start();- ^, s6 t! z! y4 {. }3 Y. n( z
if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";7 ]( z/ c& A0 I' J4 }/ W
}else{$ c' k( P# Q" ~
echo "<font color='red'>输入错误</font>";
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}
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?>/ [/ ^& y; N% K; A2 e; u
<!DOCTYPE html>1 }' D1 Z% ?* \8 [- _
<html>
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<head>
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<meta chartset="UTF-8" />) G) M! V2 ^8 S0 I: k: v8 H: L; @
<style type="text/css" rel="stylesheet">
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a{
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text-decoration:none;7 O" @0 m7 j7 {4 _! |; e A+ f+ W# j
font-size:30px;
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color:blue;( q* d7 @6 x L1 S0 m, o
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a:hover{
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text-decoration:underline;
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</style>
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</head>. ?; s5 s; U5 g8 J, X$ F/ J
<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()"/>" o: Y/ P; d9 K/ t; ~
<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 />
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<input type="submit" value="提交" />7 O& [$ E7 ]( W5 y4 P
</form>0 r7 `8 L2 p& E) a0 T9 U, r. x
</body>$ S9 [- ^4 B0 C' b0 N
<script type="text/javascript">( F( g- N# R: {$ X+ k E. }
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function changeCode(){
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var img=document.getElementById('img');0 V2 k2 z0 }% c/ p6 c n
//img.src='index.php?r='+Math.random();
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img.setAttribute('src','index.php?r='+Math.random());
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}
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</script> H- T+ v7 K) v& j8 N9 g
</html>

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