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');) E. V1 H5 A& p n& M; `
// 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, $color);
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// for($i=0;$i<4;$i++){
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// $font=6;& ^& O; i$ f8 I7 F2 l- ~4 q& D
// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);" V/ ~0 u/ i! c1 s
// $string=rand(0, 9);% o; H {) {9 n
// $color=imagecolorallocate($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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$fontSize=8;
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$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);; u) p, e$ g1 h. l! ]* P" ]
$code.=$string;
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// 3.2 加载自定义字体" x7 ^% j8 b2 g' j3 L* R& k
$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));# ]5 r& o( Q2 b6 h
// 把文字填充到画布' ~ g' V' H: y$ _" F# g4 Z2 R" Y
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);9 k, A; J# u6 M/ f% Q
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$_SESSION['code']=$code;//存储在session里
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for($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), $pointColor);/ C0 ?1 C U8 R& w/ C k2 f, M
}
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));3 x- m& U; k3 o5 z6 E9 R. z
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);( I/ t1 F, U- J t+ z& @
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imagepng($image);% [" K% i9 i; |; M) o( K8 ~; Q) {
imagedestroy($image);
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?>

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form.php

<?php+ ?. l# T: Z7 P; |7 b* S
if(isset($_REQUEST['code'])){0 \. f5 b( T! `' N9 ^
session_start();
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if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";
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}else{% d4 M2 ?2 U* Z& g3 o
echo "<font color='red'>输入错误</font>";* L5 m; u1 x0 i% b5 k
}
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?> j: w( y! Z- `5 w8 l3 O
<!DOCTYPE html>
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<html>
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<head>0 U% q- X' w7 C4 Q; e7 a
<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">: u* q9 h/ k1 s4 z( J" e
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text-decoration:none;% m9 g) ~7 ^* v* J& C$ v! O+ K
font-size:30px;
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color:blue;9 h6 p- D9 N0 L
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a:hover{# g; N4 k2 v2 R, g; A! |
text-decoration:underline;
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}
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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">
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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 /># H K, F l4 F' b: t7 j
请输入验证码: <input name="code" /><br />
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<input type="submit" value="提交" />/ l: S B" U+ f2 V0 \
</form>( t4 K3 n0 L1 s3 O
</body>2 S( i, Q0 ^) |* o: u! D( ?. a3 P: B1 l
<script type="text/javascript">) ?/ O$ ?# y5 v8 `
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function changeCode(){
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var img=document.getElementById('img');- i$ g, X# X, t# r, ^0 k) q; E
//img.src='index.php?r='+Math.random();, y. N5 X1 e2 u5 |8 G
img.setAttribute('src','index.php?r='+Math.random());
}
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</script>
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</html>

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