验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start(); {$ F( I: D* B) \0 H2 d
// 丢弃输出缓冲区的内容 **! y4 n1 U6 z4 f1 h- B {
ob_clean();, {/ k2 F+ H, V0 {$ E7 {; v
header ('Content-Type: image/png');
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// 1 创建画布
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$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);. j7 E3 l& l9 E1 f; G) Q
imagefill($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);/ E% g" b) v) B6 h, w, w
// $string=rand(0, 9);7 i* i! F- Z" W& Z" L& E% u
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));& b/ k3 L7 C) u) ~
// imagestring($image, $font, $x, $y, $string, $color);
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// }3 X& |& I6 M. j2 D- P" c
$code='';7 H* v5 o! l, a( L! q" @4 L
for($i=0;$i<4;$i++){3 F3 S" G7 P. J( ~
$fontSize=8;; Y5 V [( `+ @( q, r9 B
$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);) h. \- [9 D* G% B/ W% A
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';" Q+ B; @4 D# t
$string=substr($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';" {7 O* T" l% s ]3 s
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));7 l% B L5 x1 B2 ]$ C, }3 x# j
// 把文字填充到画布" P- o* E8 V( z3 a- z7 c, A
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);( Q' m+ l) k$ H
imagestring($image, $fontSize, $x, $y, $string, $color);- i2 j" b& V1 Q) O2 D
}
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$_SESSION['code']=$code;//存储在session里! B1 c7 p4 W* O3 p1 \! X
for($i=0;$i<200;$i++){5 `% M$ y' p7 _" h/ E
$pointColor=imagecolorallocate($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++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));7 o* v/ J z% O* r ^+ K
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);; X, o. k4 c6 D- ?% N: Q
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imagepng($image);
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imagedestroy($image);4 ?# @4 `$ _* |6 J
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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']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";; Y% h' q; x, P- M/ [1 T1 e
}else{
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echo "<font color='red'>输入错误</font>";
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?>
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<!DOCTYPE html>0 `; d4 Y' [% c) m
<html>) A K6 M! o. w9 B- q. U
<head>
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<meta chartset="UTF-8" />, x2 G! W5 |3 V& ]
<style type="text/css" rel="stylesheet">
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text-decoration:none;
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font-size:30px;
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color:blue;
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}; j& f" {+ A* B8 P
a:hover{
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text-decoration:underline;
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}
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</style>4 n3 H/ S, G0 b( }0 Q9 H, p
</head>, c! @! b6 s$ X; [% b4 P, f
<body>1 `$ ]& |2 K- n( F7 t. {
<form action="form.php" method="get">0 W3 C# E9 U! C
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 />) b. D/ J" }$ T, |
请输入验证码: <input name="code" /><br />
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<input type="submit" value="提交" />) I; e0 J6 L* B3 Y
</form>' p+ x: h( K& J5 t! Y' A H
</body>
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<script type="text/javascript">
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function changeCode(){4 f! L8 m3 t9 j: M
var img=document.getElementById('img');
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//img.src='index.php?r='+Math.random();6 t4 k& @( q* M9 M& C% e& J
img.setAttribute('src','index.php?r='+Math.random());3 `% x" m }' Z. J( }2 z, g9 h
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</script>2 z7 _+ f9 f& I6 J
</html>

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