验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php0 q, C$ Q8 x. J
session_start();# d, B" d# q$ q1 j+ Z$ @1 N' y
// 丢弃输出缓冲区的内容 **7 S$ d. Y) k; y. v, d5 m6 N
ob_clean();: f# ^7 q8 B; F+ G5 c
header ('Content-Type: image/png');
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// 1 创建画布
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$image=imagecreatetruecolor(100, 30);: X. _+ O4 F2 [% u. F2 ?
// 2 画一个矩形并填充背景颜色为白色3 s: [7 G0 r/ c N
$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){+ @3 A8 h0 U$ X) _
// $font=6;% w8 _8 A) N- o& x
// $x=rand(5,10)+$i*100/4;! L; c! a+ {0 Q$ h1 r3 H
// $y=rand(8, 15);0 i4 t) ] b, c. g3 x
// $string=rand(0, 9);
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// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));+ n- M& s! ^( S6 S
// imagestring($image, $font, $x, $y, $string, $color);
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// }* p/ n- ]0 n7 p
$code='';
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for($i=0;$i<4;$i++){
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$fontSize=8;
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$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);5 k- O1 ~& v( F5 Y7 {7 H: l
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';5 s% v. H0 l& @! ]
$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;) P; o0 I; I/ J2 ` g; z8 i, }
// 3.2 加载自定义字体" L) B6 j% K: u R& N. Y7 Y6 A' x- i
$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));0 k( Q# j; M7 L$ M# w: N; }
// 把文字填充到画布, h7 v- R( ^; W; |% e5 L) a
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);' s s4 a5 [4 G# p5 y# p
imagestring($image, $fontSize, $x, $y, $string, $color);% V; L% w6 J; F3 K9 g
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$_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));5 \ Y1 q- Q; p6 ^4 P4 E! W% K
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
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}) G: I+ w% Z6 K5 q9 l( ?
for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));& x+ k) @7 e& p+ z) M5 r, a
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);) n0 g5 A, |; K* u
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imagepng($image);
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imagedestroy($image);" x+ G8 h9 G; e! z1 \& n; J
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?>

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form.php

<?php4 y( h- Z7 k) j9 W
if(isset($_REQUEST['code'])){" i+ ~3 p( z2 H! m& \
session_start();0 a |# R; F# W! K" q
if($_REQUEST['code']==$_SESSION['code']){4 T2 r R9 L' q9 `6 d
echo "<font color='red'>输入正确</font>";
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}else{* z* D6 N. Q8 }. Y4 Z6 Q) H8 l
echo "<font color='red'>输入错误</font>";6 l/ J( C, t8 W5 o7 |) p
}
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?>
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<!DOCTYPE html>
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<html>
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<head>2 ^. G3 L0 @+ c" I! Y- s
<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">5 g" ^" s; A# L) |8 ^
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text-decoration:none;
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font-size:30px;
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color:blue;5 b7 p! b" H" ^
}
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a:hover{4 p! k5 E) u' ^5 d3 m" e4 o! m
text-decoration:underline;
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</style>2 Z2 G5 Q- \) B' `. |* X
</head>9 w8 Y. F, J9 ?! Q9 |$ ~
<body>
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<form action="form.php" method="get">4 \, v6 t7 u5 H( O! p
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" />
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</form>5 i. K+ ], ]. ^+ p( R
</body>. ` W0 S2 r. Q; V( }; J
<script type="text/javascript">3 O* C% G! @5 l9 y
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function changeCode(){8 T+ m. f; w5 h) [5 `8 ?2 [- c: K$ @& m
var img=document.getElementById('img');
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//img.src='index.php?r='+Math.random();) i) |9 n; x: d% {0 K" A o
img.setAttribute('src','index.php?r='+Math.random());5 O! W2 {7 I) o, h
}
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</script>
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</html>

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