验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();8 H6 k4 M! d# d3 J( p/ N
// 丢弃输出缓冲区的内容 **8 G1 m8 R+ b' y) q* L& b
ob_clean();- \0 P9 F( r- j) [( ]" |
header ('Content-Type: image/png');% a$ C: Q8 g5 `& O" [' t) E
// 1 创建画布
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$image=imagecreatetruecolor(100, 30);6 N4 t4 i% E( y* U
// 2 画一个矩形并填充背景颜色为白色! y) s+ ^ u% K5 n U) K
$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);5 }4 ^5 H4 d J" b
// for($i=0;$i<4;$i++){' q8 u" u0 v% _$ T( b2 }
// $font=6;8 w& N/ r; y! \6 I; \; x
// $x=rand(5,10)+$i*100/4;% [. W. Q7 U. h
// $y=rand(8, 15);
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// $string=rand(0, 9);: L# q; P# L9 F6 G/ Z" ?
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120)); c3 X1 {& ]% _, D
// imagestring($image, $font, $x, $y, $string, $color);; t- M+ @- u" l V. s
// }& Z) `/ T9 `6 N: _% J, u# f4 u" z
$code='';
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for($i=0;$i<4;$i++){- @' Y: ~ C' n
$fontSize=8;& u( |% J, l$ i2 `
$x=rand(5,10)+$i*100/4;, v' j/ t% s r: J; _1 H3 k" Y! V
$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($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));" t& j' b6 J- a
// 把文字填充到画布/ V; A' \9 w5 s2 v, c& W: o
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string); ?' X' e O$ i( z9 \( q, ~- I
imagestring($image, $fontSize, $x, $y, $string, $color);
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}
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$_SESSION['code']=$code;//存储在session里% F! b3 i& L- v
for($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), $pointColor);
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}
# @6 V% n3 E0 b8 D) F/ W
for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));9 L% ?" u* p9 ^
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);! d5 O$ M0 l: w; h* F: n
imagedestroy($image);
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?>

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form.php

<?php$ u7 n' G; ?, h, F
if(isset($_REQUEST['code'])){ @0 q: U& o+ E8 L% w6 \! c4 h0 V
session_start();
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if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";8 c0 A, p% e6 E2 J
}else{. G+ _1 S; q! [* R$ I
echo "<font color='red'>输入错误</font>";9 d& |; C) R4 A/ {" f7 d9 ~ |; p5 }
}
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}( }6 _/ E/ ~: J/ |. A0 r2 Z
?>
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<!DOCTYPE html>
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<html>
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<head>
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<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">) u1 @' y& x9 w7 W+ j
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text-decoration:none;; R2 }6 G' O# K; K, y! _
font-size:30px;
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color:blue;. C, s1 s% d2 ?! b' @' T
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a:hover{
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text-decoration:underline;% s0 \% Z; u% M( ^/ L c8 u" O. q
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</style>, T/ |4 e' F, |" K7 K2 y
</head>
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<body>
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<form action="form.php" method="get">! |1 t9 n0 N n' B
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" />7 N \1 j( u, ?4 j/ S, d# e- w- k
</form>8 c2 I* \7 z: J# Y
</body>
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<script type="text/javascript">1 b6 |& M D8 v) M( z9 l$ x! Z9 w( [
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function changeCode(){
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var img=document.getElementById('img');0 ]7 M J1 v& T/ I
//img.src='index.php?r='+Math.random();
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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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