验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php8 n# ~9 k) g9 I* \
session_start();( I8 D! d% L* v# B
// 丢弃输出缓冲区的内容 **+ `/ ]) J, Y+ M( _" s
ob_clean();
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header ('Content-Type: image/png');9 ]5 M1 [! B! h) h4 v; n2 V
// 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/ E# X. x; u/ v& k% i8 Q/ N& h3 Z
$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){: c* m2 c: K5 |" G" z$ {" ~
// $font=6;, e* ^8 q5 f/ \7 B( Q
// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15); |7 d8 z# v7 M) H( k
// $string=rand(0, 9);
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// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);: ~6 m% k% R0 O0 {
// }
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$code='';
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for($i=0;$i<4;$i++){- b& W; \$ Y9 g( j% |3 T( r0 I
$fontSize=8;6 x5 k8 e$ ~1 K1 L7 G% N+ U( W
$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15); F) g8 N* L. G. F$ i) h Q- n
$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';% x8 Y- H) h. }3 b! k% q
$string=substr($data,rand(0, strlen($data)),1);$ k2 V1 N! P; Y- x
$code.=$string;; S9 o5 k8 i) Z) j" g
// 3.2 加载自定义字体1 W4 Z0 S! B) I3 n1 K3 s* J
$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));; T* `" p% e: `5 U% N3 B9 }, ]6 I$ H
// 把文字填充到画布9 h4 N! Q! E, F7 \% W1 U# t; J
//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']=$code;//存储在session里2 R$ C+ n, p& ]" ~( Q
for($i=0;$i<200;$i++){3 Q) \, x/ U: z# p9 q: I9 j
$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));5 D# @( m: O5 a" ]: F9 ?7 n
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
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for($i=0;$i<2;$i++){
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$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));" G& r& O) n6 w3 s& w' J! |- @; [
imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);! C1 S8 J4 o. P; c3 T8 G3 N
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imagepng($image);$ c- J) z3 X$ _) W& }2 C9 w5 B2 L
imagedestroy($image);
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){
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session_start();
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if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";& l: C: g0 ^0 i! {3 ^6 K
}else{0 T; v; n& r) v" I/ W0 E, S& x
echo "<font color='red'>输入错误</font>";( v/ ?2 d0 {9 F' y3 B
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?>5 m9 @4 Y+ N. p$ ]2 R4 t S
<!DOCTYPE html>
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<html>
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<head> K8 ?! G5 f9 A* P8 ~/ ]
<meta chartset="UTF-8" />* X, n' ~) w7 O, d
<style type="text/css" rel="stylesheet">
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a{
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text-decoration:none;
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font-size:30px;
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color:blue;: T. _ h$ X1 `6 g
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a:hover{( t! S' c% C0 e9 i* V, l
text-decoration:underline;! n5 b! a% l9 @4 t0 t8 h
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</style>4 p$ v: T* ?( l6 k( W
</head>( T% J, S. S( [5 q5 h
<body>
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<form action="form.php" method="get">5 o% Y: _. j6 m$ E' y6 Y
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>% C& n# ~" V& ~) C
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br />$ }( |: W! E( i& Q; p4 y9 @
请输入验证码: <input name="code" /><br />
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<input type="submit" value="提交" />6 ~$ t1 r$ _( w% N3 P# X
</form>: l9 |% j3 d, ^+ i `
</body>8 Y( Q6 X$ q4 N9 x* F
<script type="text/javascript">$ r' ?3 x7 F ~+ ]; w7 v, R; H2 }% S
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function changeCode(){. d' n8 r" w1 C" ~6 I/ S: I- o
var img=document.getElementById('img');
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//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>$ o. v' s' p/ d& Y7 R
</html>

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