验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();9 M2 @1 u4 b1 B' e1 j5 o% S; w
// 丢弃输出缓冲区的内容 **
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ob_clean();9 }" Y5 I ]1 L
header ('Content-Type: image/png');+ G7 ]& {. Y/ `" D0 n
// 1 创建画布
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$image=imagecreatetruecolor(100, 30);
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// 2 画一个矩形并填充背景颜色为白色3 y$ k' \/ x8 |- N
$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){
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// $font=6;$ @& Q. E1 ~8 ]; n
// $x=rand(5,10)+$i*100/4;5 A! P6 r' W, ^0 m- D
// $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));* }& j/ P$ x0 V+ v8 c- _
// imagestring($image, $font, $x, $y, $string, $color);; t& c) N( U) a) }. S3 y5 x$ h
// }
$code='';* @0 a) w* B7 ~0 C2 ~
for($i=0;$i<4;$i++){- m1 d+ y @) Z* c1 ^$ s# B
$fontSize=8;
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$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';4 C5 v# Q% b% X# m- z2 v
$string=substr($data,rand(0, strlen($data)),1);9 L3 x) [; x5 v7 E
$code.=$string;% h! u" L6 Q3 Y! U2 Z% }, `
// 3.2 加载自定义字体
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$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));8 z8 h7 f& `* [, `' L2 y, g+ r
// 把文字填充到画布
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//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);1 Q8 A" q) Y% g$ u
}
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$_SESSION['code']=$code;//存储在session里! D) `! z. d4 T
for($i=0;$i<200;$i++){1 E* S3 P* {$ d' u
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));+ k. R, U8 t* J; M! m; f
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);: @! F @! F" a% C+ V( e7 H
}
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for($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), $linePoint);
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}
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imagepng($image);* [6 q7 X% |" S0 r. B+ e. c5 z" w
imagedestroy($image);
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?>

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form.php

<?php- e+ B4 m. j: w w% E- J
if(isset($_REQUEST['code'])){4 V7 e6 K' b; `$ @% C
session_start();$ R8 {6 y& N# P. {
if($_REQUEST['code']==$_SESSION['code']){$ @3 X0 @ B8 }% ]
echo "<font color='red'>输入正确</font>";. Z; a. g+ f' H/ D" w) Z
}else{ k! B3 Z8 Q w
echo "<font color='red'>输入错误</font>";0 R8 D: W/ Q9 s! f2 A `# x
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?>
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<!DOCTYPE html>0 V4 c2 J2 ]0 I5 q
<html>
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<head>
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<meta chartset="UTF-8" />+ t: y( O8 l) i, I$ |5 A7 X5 ^
<style type="text/css" rel="stylesheet">" b" s% H! J+ Y; q8 }, f
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text-decoration:none;3 o& i' t3 A' R- y7 s. c3 ^- \
font-size:30px;
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color:blue;
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}
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a:hover{
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text-decoration:underline;9 }- X* @! j( o$ K" _' C; r, e/ K
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</style>; c+ n" s3 c$ c$ I% e
</head>9 T9 e' j$ q/ ], n( b
<body>! l3 m" U6 _1 U4 \ M- W
<form action="form.php" method="get">
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验证码: <img id="img" src="index.php?" onclick="changeCode()"/>2 }. L% p3 H4 N
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />9 }6 W7 h) F% v$ x6 Y
请输入验证码: <input name="code" /><br />" c2 W) }% _% e7 c- e) J3 |! Y
<input type="submit" value="提交" />+ n1 F! y' o1 w) l6 [6 N
</form>
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</body>. R: i k9 h q5 Q& k r7 t+ U
<script type="text/javascript"> W+ ~* a9 D1 \& Y' n1 X" V
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function changeCode(){
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var img=document.getElementById('img');7 [3 r5 y. @4 G6 P! |$ ?( t
//img.src='index.php?r='+Math.random();2 C- q1 V* b5 s' n( }$ q9 K, t z& W
img.setAttribute('src','index.php?r='+Math.random());3 p0 G0 a+ K2 p- w
}
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</script>
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</html>

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