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admin · 发表于 2018-12-16 01:00:13

index.php

<?php$ Y g6 I( M% w8 J8 _. |# G
session_start();9 c2 Q# C% O3 }% O/ e2 ?7 {4 S
// 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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$image=imagecreatetruecolor(100, 30);' X5 |, O; B& B2 n" _$ t+ g
// 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, $color);6 d' a8 C% B% [8 E B' G
// for($i=0;$i<4;$i++){
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// $font=6;: L1 s& o0 W7 n+ h* o4 s5 n
// $x=rand(5,10)+$i*100/4;; v/ v' ?7 m( E
// $y=rand(8, 15);0 [0 y% A& S5 F0 u/ g& D
// $string=rand(0, 9);
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// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));% M9 g6 P: m- W, y
// imagestring($image, $font, $x, $y, $string, $color);
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// }, S7 V Q0 H" S# ~ l3 _! `, O
$code=''; g7 `9 I8 Y; @! D+ M) d
for($i=0;$i<4;$i++){ U5 }% G- F E! @$ Z# |; T
$fontSize=8;
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$x=rand(5,10)+$i*100/4;& v& c, t& H* V
$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';1 X* ^! ~; n* W( `1 i# ?
$string=substr($data,rand(0, strlen($data)),1);; X# G5 V) k8 Y5 o4 n# N$ _/ h& }: T
$code.=$string;
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// 3.2 加载自定义字体
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$font_file = '1.ttf';2 Z+ r0 y% ^/ j* a" M
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));# }8 y; [' Y& P& `5 a5 p8 }
// 把文字填充到画布- u% P) I: P, Y% k9 u, K8 s- A
//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);
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imagestring($image, $fontSize, $x, $y, $string, $color);
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}
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$_SESSION['code']=$code;//存储在session里
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for($i=0;$i<200;$i++){ A3 w8 x V8 M3 f3 ?0 v7 r5 ^
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));
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imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);8 A- D3 q1 k) H! t6 D. a
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));+ J* B6 p* o/ T4 {4 G& B! e
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);* T7 j. w, A/ ^% [. q) L2 H
imagedestroy($image);- Q# q2 z3 Z, i8 L) Z& ]
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?>

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form.php

<?php
# [2 F7 |7 @ B0 M! S
if(isset($_REQUEST['code'])){. J5 I% m+ E; ?3 B
session_start();$ `. J$ m# C, g
if($_REQUEST['code']==$_SESSION['code']){. b, F6 ? U) `) o5 J9 w
echo "<font color='red'>输入正确</font>";0 O$ f Z5 _) D8 L
}else{! U; B/ z2 f' d* S
echo "<font color='red'>输入错误</font>";+ h" @! F$ G* b7 ~3 a: a5 j
}" L. p( o8 I' u. m5 M
}
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?>
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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">/ M/ Q, F+ k. F6 c5 M; H% o1 @
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text-decoration:none;
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font-size:30px;: z3 f& @6 i! P) t H& Y
color:blue;: k, k( A9 u/ |' ]" L- F- m
}
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a:hover{/ I' H3 [9 j5 {
text-decoration:underline;4 X; O& R( d& U4 y
}
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</style>& w: A# i3 t( k; R* i8 y" T
</head> d8 u+ ?' J4 J. H8 ^$ w- e; c
<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()"/>5 j0 ?6 i, n2 y
<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>
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</body>
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<script type="text/javascript">' `, w. f! L. H' I
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function changeCode(){
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var img=document.getElementById('img');& ]( F0 q2 e+ f# ?6 s2 v8 d$ k1 D
//img.src='index.php?r='+Math.random();
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img.setAttribute('src','index.php?r='+Math.random());3 G7 z, z( a" a) O+ l& Y/ J. z, X* i: ^! G
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</script>* K( G( r/ z% T: Y; I# ]
</html>

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