验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();. Y1 p. r. d Q, m
// 丢弃输出缓冲区的内容 ** D5 j" [: j% v$ G! _4 b: l& Q
ob_clean();
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header ('Content-Type: image/png');% ?2 r* F; g9 p2 u* q
// 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($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);+ Z3 a- F1 f7 x" f% b
// for($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);
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// $string=rand(0, 9);; B# L9 N- I8 I$ u8 a. `
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));1 L0 a% S, i0 W( S
// imagestring($image, $font, $x, $y, $string, $color);! X$ S: p# K; Q
// }
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$code='';; c& M& |+ P% O4 y
for($i=0;$i<4;$i++){
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$fontSize=8;4 o. m C/ P' K
$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';' \' M+ l4 T; f* g5 j9 I j z
$string=substr($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';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
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// 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, $color);
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}
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$_SESSION['code']=$code;//存储在session里9 J/ g4 T. n% z8 E, L, q
for($i=0;$i<200;$i++){5 B# S; {7 j' `) o
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));
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imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);/ c: ?5 V8 g+ u1 a- Q: }
}
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for($i=0;$i<2;$i++){( V) i. M, X, n$ [1 z
$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));' ^: c9 o2 d' Z# _
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);/ N+ w% @7 v" u; I, n3 I
}
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imagepng($image);
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imagedestroy($image);
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){0 r; T5 d+ W4 d4 [3 o
session_start();" B: O7 M, S, `( B7 S9 F; b+ M; g) H0 l
if($_REQUEST['code']==$_SESSION['code']){, }1 ~6 x8 q+ }2 D" ^% ^
echo "<font color='red'>输入正确</font>";8 d* ?$ Y) Z2 J0 q2 X0 C
}else{& t: W# G' i; ~
echo "<font color='red'>输入错误</font>";
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}" w8 m5 W4 b) o7 i
}
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?>
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<!DOCTYPE html>
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<html>0 v" U7 G, p$ S/ T3 q; g# q' w
<head>
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<meta chartset="UTF-8" />2 X0 v; e. O. z6 y
<style type="text/css" rel="stylesheet">
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text-decoration:none;
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font-size:30px;/ l8 N3 n U9 x) `
color:blue;
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a:hover{
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text-decoration:underline;
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}
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</style>( R0 i" x( \. s
</head>: }! I3 D# }4 M6 Q
<body>- K* A& d3 d; n S: {! Y8 f5 R$ J3 s) Q
<form action="form.php" method="get">
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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 />
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<input type="submit" value="提交" />
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</form>3 u0 x% i/ d! |" h, v- S; x
</body>2 L5 G) k: w+ }" A* l2 K
<script type="text/javascript">" z6 i9 n% m" Z2 y6 ?
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function changeCode(){1 B$ O" f: o6 R2 w5 R+ ]4 D8 V8 Y2 E2 {
var img=document.getElementById('img');# y/ I7 |' g& v4 r6 h" {, T/ g: |. y
//img.src='index.php?r='+Math.random();8 f a; S$ e$ f% j+ j. X% n, ^
img.setAttribute('src','index.php?r='+Math.random());
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</script>- X9 k7 w/ w, o4 p
</html>

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