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 **
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ob_clean();
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header ('Content-Type: image/png');
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// 1 创建画布
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$image=imagecreatetruecolor(100, 30);, I* d) Y( _! X* T
// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);% j/ Z- O5 F8 x c! i! `
imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){6 |2 m2 Q2 D! @% |6 x. m
// $font=6;6 F% ]. i6 H1 ]+ T, R; U6 E
// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);: x9 l4 h' ]/ t. T$ u
// $string=rand(0, 9);) s: z) n6 m& O3 i, V) W2 t. }
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);6 v, _; R* a; ]
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$code='';
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for($i=0;$i<4;$i++){
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$fontSize=8;
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$x=rand(5,10)+$i*100/4;3 c" \+ d; F [" ]$ i4 a
$y=rand(5, 15);1 ^0 T3 t% M W; P( m
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);' W$ R0 G! R& P* ^& m
$code.=$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($image,rand(0,120), rand(0,120), rand(0,120));* p1 u7 ~, f' B4 t
// 把文字填充到画布9 n- y. b. H7 H
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);; K0 N, V, t6 g; E; `* \
imagestring($image, $fontSize, $x, $y, $string, $color);! o8 `( _5 F8 R9 d& M4 E, k; t
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$_SESSION['code']=$code;//存储在session里3 ?8 s. S8 C+ Z# |
for($i=0;$i<200;$i++){
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$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));
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imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
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for($i=0;$i<2;$i++){0 T: L* |/ u# ~" J7 \: b
$linePoint=imagecolorallocate($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);3 ^2 U$ O" C `- A! v) R
imagedestroy($image);9 g. c5 F+ o7 L8 l9 w4 E9 G
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){1 a( s0 X _* F% m) w0 O, c
session_start();
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if($_REQUEST['code']==$_SESSION['code']){: n0 n: x- H; ~: `% W/ d
echo "<font color='red'>输入正确</font>";( u. d5 B1 T0 n+ p6 Q% s
}else{% \/ j& }& p1 B
echo "<font color='red'>输入错误</font>";
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}
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}
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<!DOCTYPE html>
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<html>
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<head>6 X8 v( w/ k' u7 R/ e
<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">
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text-decoration:none;- n2 C9 |) Q2 N* a: W! Z( q3 B8 c' s
font-size:30px;1 ~- e" e) n& @ s) I
color:blue;: a9 e" \ m' ~+ J
}
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a:hover{
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text-decoration:underline;5 ]7 S8 I( j9 t; l- { G8 U5 b+ X
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</style> L8 [( c9 m" @, H, j/ g4 S8 M
</head>0 L: r' O0 Y0 ~3 w
<body>: [. r' V# O: P2 [0 J3 U
<form action="form.php" method="get">
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验证码: <img id="img" src="index.php?" onclick="changeCode()"/>
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<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />
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请输入验证码: <input name="code" /><br />. _3 s* w/ S5 ^- R" I, q
<input type="submit" value="提交" />' i( e" {0 n1 \$ e8 f/ H* N
</form>9 t6 f9 }) \6 z- _4 R
</body>* r8 \; D+ O1 E8 v7 k. X: m
<script type="text/javascript">% ]4 D$ f; \- z) k
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function changeCode(){
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var img=document.getElementById('img');/ T/ z# ?9 _3 Y) I: }
//img.src='index.php?r='+Math.random();
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img.setAttribute('src','index.php?r='+Math.random());& h! K% O0 R0 ^5 w0 z. `2 Y4 G
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</script>" S: C. z/ ?: |, e) G2 I' ~! n8 `9 A
</html>

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