验证码

admin · 发表于 2018-12-16 01:00:13

index.php

<?php
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session_start();
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// 丢弃输出缓冲区的内容 **- q. u" z1 S7 w
ob_clean();
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header ('Content-Type: image/png');# N9 C. \& R; j* X
// 1 创建画布$ S" [6 r" U! R0 C2 J1 N
$image=imagecreatetruecolor(100, 30);0 t# k0 R5 ^! E
// 2 画一个矩形并填充背景颜色为白色
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$color=imagecolorallocate($image, 255, 255, 255);$ ]5 Z& ~: A- C7 m* g! d5 |2 x
imagefill($image, 20, 20, $color);
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// for($i=0;$i<4;$i++){+ Y" c( h v7 k' t$ v! a
// $font=6;) v1 B; u X' o2 [
// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);
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// $string=rand(0, 9);1 L; b/ f, d0 [6 B
// $color=imagecolorallocate($image, rand(0,120), rand(0,120), rand(0,120));
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// imagestring($image, $font, $x, $y, $string, $color);" b+ H2 G# D% I
// }
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$code='';
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for($i=0;$i<4;$i++){- Q5 b9 ^0 l4 X% C; t) j" s# N
$fontSize=8;
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$x=rand(5,10)+$i*100/4;5 w1 }- I0 o+ U* k
$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;7 o7 W7 E+ G6 F+ ^! m
// 3.2 加载自定义字体
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$font_file = '1.ttf';
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$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120)); C/ [1 R, \( j6 Q
// 把文字填充到画布
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//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']=$code;//存储在session里, d% S( M+ P, ~9 f4 E
for($i=0;$i<200;$i++){
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$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));/ A$ L/ q' V7 G
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));
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imageline($image, rand(10, 50), rand(10, 20), rand(80,90), rand(15, 25), $linePoint);0 s5 _, T% U8 L- I7 ^
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imagepng($image);$ x$ i) A4 U! u& P2 a
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']==$_SESSION['code']){9 g9 S! D Q% z2 f8 ]/ O& W
echo "<font color='red'>输入正确</font>";
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}else{; i2 r5 ~0 R( F6 X; m& Y0 X0 d
echo "<font color='red'>输入错误</font>";9 X. r. x( j1 a
}
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}
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?> d% ]! g- Q2 ?% A u
<!DOCTYPE html>
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<html>
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<head>
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<meta chartset="UTF-8" />
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<style type="text/css" rel="stylesheet">9 ~0 K( ~3 s N' X
a{
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text-decoration:none;1 [" V/ ?; S7 c' I' [! E- J
font-size:30px;3 i8 Z e4 t( A$ Z
color:blue;6 S h, D# V/ i. Y9 c
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a:hover{
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text-decoration:underline;/ q- j, b! t" q* G" U4 O
}
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</style> ~+ Q+ f: B3 _6 W
</head>: R* F. x A4 l" k- |
<body>6 x0 Q" d, Z. S0 Z4 {
<form action="form.php" method="get">6 U- r. U( y0 {
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" />* v" s! F6 }1 V! l+ z* @
</form>! A4 _ U3 }% p: n. p3 J" n7 U
</body>
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<script type="text/javascript">
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function changeCode(){8 L% z6 d* ]6 @ A8 T( y
var img=document.getElementById('img');1 J1 _" R8 D- [: x/ m1 X
//img.src='index.php?r='+Math.random();
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img.setAttribute('src','index.php?r='+Math.random());2 z9 D+ [- Z8 [' m6 }5 i3 A B
}
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</script>
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</html>

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