验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();4 H# J' W f7 G% a
// 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. \1 S, m) Y: N6 V: v+ h h0 E, W
$image=imagecreatetruecolor(100, 30);7 s* g2 _# z2 \5 e4 ?6 o. y
// 2 画一个矩形并填充背景颜色为白色7 B( `( s1 x m# ?, i$ X
$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){2 \2 {3 A/ U$ \2 m# C9 F0 j
// $font=6;
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// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);7 k! l6 i% B. p! V1 t! u6 [& i$ P! B
// $string=rand(0, 9);/ x: Y1 ]8 _- s$ U( O
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);9 U4 p! k: o. ^; B
// }
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$code='';# }' m/ X7 r) U& y& ^
for($i=0;$i<4;$i++){. g+ b m& u/ ]2 ^: @
$fontSize=8;
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$x=rand(5,10)+$i*100/4;' g9 `: A2 Q% |6 M( {2 S
$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';" s1 R8 p, p- J" d8 F
$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;: f: m* n* R' b% n: f6 t
// 3.2 加载自定义字体
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$font_file = '1.ttf';/ f0 c2 G/ r% v ]8 l$ J
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
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// 把文字填充到画布, n3 @/ ^; E- Z+ T6 F. ~0 @; H3 T
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){5 n7 E' O) q4 |' H/ I9 e% p- _
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));! Z0 Z! k% C( U
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));
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imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);
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imagepng($image);# w7 o/ ?0 C: z7 Y( l3 T
imagedestroy($image);
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){
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session_start();; j- c% F% K+ g/ v0 g
if($_REQUEST['code']==$_SESSION['code']){- Y% L" f7 U8 c) b6 D! [
echo "<font color='red'>输入正确</font>";( z3 y* ^* X+ R/ |* i# X8 g& |/ {6 T
}else{
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echo "<font color='red'>输入错误</font>";; s4 \, @( f+ p* g$ H* b8 ^& ^3 `8 z: U
}
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}
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<!DOCTYPE html># c, I) k+ M0 A4 p: Z
<html>' D' a+ S; }7 X3 ?/ W) R; C1 t0 Z4 j
<head>
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<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">
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text-decoration:none;
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font-size:30px; s! z4 v1 O! ^0 Y" y
color:blue;' }8 f8 u' X, u: n9 G# I
}
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a:hover{/ Z; Z6 ]$ [2 T" O% F
text-decoration:underline;# o. t3 m/ a* `
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</style>; `# u8 d/ q* o
</head>' @0 e( J0 i8 W2 i, p8 }4 F
<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 />+ L$ b; }9 L5 P
请输入验证码: <input name="code" /><br />! u U1 u3 ]1 T% d0 f
<input type="submit" value="提交" />
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</form>4 `/ ^& Y% W* ~ W7 c
</body>
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<script type="text/javascript">
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function changeCode(){: H, W' V0 D2 f7 h1 V: T- A
var img=document.getElementById('img');
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//img.src='index.php?r='+Math.random();7 @4 c" a. n3 O8 {) t! j& O5 E
img.setAttribute('src','index.php?r='+Math.random());) f. P- t& @0 @( G
}
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</script>7 X3 p1 f2 E0 a. H$ @, [2 u
</html>

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