验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php2 ]* @, n/ n b9 n4 L/ C
session_start();
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// 丢弃输出缓冲区的内容 **
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ob_clean();
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header ('Content-Type: image/png'); {! l7 N j) h) g& p5 `9 E( h
// 1 创建画布
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$image=imagecreatetruecolor(100, 30);7 W* Z1 ~; H, O) W# {( A, S/ \( ~
// 2 画一个矩形并填充背景颜色为白色- ~" |# F! l, w+ n, T( W: M( g
$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){, P5 B" @+ B0 l+ Q8 m% Z6 g
// $font=6;
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// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);- m; d( [4 U2 X3 J
// $string=rand(0, 9);1 y: E" |. O0 P
// $color=imagecolorallocate($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='';' a0 ^0 ]$ z6 Z$ I5 Q' b
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$fontSize=8;2 d0 J% v& s. B; F6 D1 g) j
$x=rand(5,10)+$i*100/4;0 [. w2 H7 T" j
$y=rand(5, 15);( \' N4 @4 G. U7 t" I; G5 b
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;. @9 ]; b. v5 G
// 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']=$code;//存储在session里/ T: R+ d& E: F& U$ t% Z
for($i=0;$i<200;$i++){
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$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));. G+ J* D$ W0 O
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));2 k$ Q$ J1 b/ t
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);6 |6 j1 }0 Q" p9 g8 F
}
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imagepng($image);& m9 U% h. C& Q3 j
imagedestroy($image);
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){9 w) `; L8 ^, V! ?; R
session_start();! q! Z0 u; ^) y4 Y' q/ `2 C
if($_REQUEST['code']==$_SESSION['code']){& Z. x/ |0 Y2 x4 e, Z' q
echo "<font color='red'>输入正确</font>";
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}else{/ ~* V( |% w- s) u8 \" J2 _3 x
echo "<font color='red'>输入错误</font>";
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}
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?>1 l5 |3 g8 J1 g: ]; l# H( ^
<!DOCTYPE html>, h( [0 e+ Z9 c& ]% n
<html>1 n5 Z6 ~& k! J
<head>+ a8 H; l( m0 E+ q8 ?7 X" W
<meta chartset="UTF-8" />2 p _7 S% j. p- I7 h: S- o
<style type="text/css" rel="stylesheet">
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text-decoration:none;* e8 e. W* W3 @8 n5 c+ q! |
font-size:30px;& @/ ~9 K o. a# u( e6 T8 t! |
color:blue;
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a:hover{ r( P6 B0 k- t
text-decoration:underline;
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}
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</style>: K# m( B- _; D- x9 q
</head>
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<body>$ N" u: P- Q$ o' N3 u+ t# m- q# M
<form action="form.php" method="get">
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验证码: <img id="img" src="index.php?" onclick="changeCode()"/>/ I0 M6 f( a7 r5 Q6 R. s/ V5 i) h6 g
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />) t, N7 q A/ w+ B$ b
请输入验证码: <input name="code" /><br />: Z; O3 d5 f3 ]# W" A( y: v
<input type="submit" value="提交" />
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</form>9 y, v3 o6 A1 m9 p: z
</body>
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<script type="text/javascript">+ Q y i( m" N, p% M h
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function changeCode(){
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var img=document.getElementById('img');
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//img.src='index.php?r='+Math.random();! _: Z9 e! a* {$ J# ]
img.setAttribute('src','index.php?r='+Math.random());
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}
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</script>
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</html>

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