验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();
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// 丢弃输出缓冲区的内容 **7 B, N; |; `+ c& N1 c3 M, s' D
ob_clean();
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header ('Content-Type: image/png');4 X+ d: v2 u9 I5 c6 T
// 1 创建画布
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$image=imagecreatetruecolor(100, 30);9 y6 ^# K" s: ? W+ M# j* y
// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){: v9 a' @2 j8 q& b/ x: H- u6 ]
// $font=6;
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// $x=rand(5,10)+$i*100/4;: {. F' k+ ^- b) V; @
// $y=rand(8, 15);- m" s. j6 ]- e9 O3 i
// $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, $color);
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// }
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$code='';
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for($i=0;$i<4;$i++){
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$fontSize=8;3 [) o' V2 J# L L9 ]/ G
$x=rand(5,10)+$i*100/4;# i2 d! f! X! ?% y8 l
$y=rand(5, 15);+ J9 J- {' q* [6 ^# K
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);' o2 v2 p. k; t
$code.=$string;
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// 3.2 加载自定义字体- ?" f1 P' ^6 N' q8 q
$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));- Q6 j3 W- @, ~8 E; ~
// 把文字填充到画布2 [6 P& E! Y2 X6 B+ V t5 J; ?9 x
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);+ z X) S7 j" T/ J6 Q$ v. ?% J
imagestring($image, $fontSize, $x, $y, $string, $color);6 e' R8 { E. h, r! D$ ^& r
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$_SESSION['code']=$code;//存储在session里" q) @) p5 _- ^) @
for($i=0;$i<200;$i++){
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$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));4 U, ?0 }; ?& B p8 A
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
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}
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for($i=0;$i<2;$i++){& Z* s1 e6 @- Z% g* w+ J( ~
$linePoint=imagecolorallocate($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), $linePoint);
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}
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imagepng($image);
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imagedestroy($image);
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?>

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form.php

<?php9 B, M$ w) b1 v3 C; ]
if(isset($_REQUEST['code'])){
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session_start();7 I8 M7 h8 R8 p# w1 I& m
if($_REQUEST['code']==$_SESSION['code']){( s% ` z5 K) ~
echo "<font color='red'>输入正确</font>";
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}else{9 P: Y! q, e( K2 A8 A: |8 O
echo "<font color='red'>输入错误</font>";
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<!DOCTYPE html>. l- m1 t# W8 `/ N4 C4 N
<html>6 P' t& _( i; v
<head>
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<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">
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a{
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text-decoration:none;
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font-size:30px;9 g* N, Y( u5 e- \5 z1 R% L$ j
color:blue;
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}
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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>
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<form action="form.php" method="get">: y3 B) C8 ]2 t: b/ V' f
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 />7 J: e4 [. d+ H' k7 q
<input type="submit" value="提交" />
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</form>, G3 V1 [) ^5 W4 N, e# {5 S, X
</body>
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<script type="text/javascript">' p& D/ l+ }0 u8 I+ n0 f0 [
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function changeCode(){2 h# w6 i; J/ |5 Q1 A; A6 P
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());
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}
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</script>6 x+ m3 \. E% v: J3 c
</html>

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