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 **
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ob_clean();* k* q. t6 ]. l7 x5 T R
header ('Content-Type: image/png');* N J6 ?* M& U R
// 1 创建画布' ~/ g+ t+ y I1 |6 L0 @
$image=imagecreatetruecolor(100, 30);" w! p6 S) J4 O* S9 [
// 2 画一个矩形并填充背景颜色为白色. N7 M9 w" B$ R+ l
$color=imagecolorallocate($image, 255, 255, 255);
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imagefill($image, 20, 20, $color);+ h( ^1 \5 |8 x5 @" g6 B; L
// for($i=0;$i<4;$i++){9 d! M- {! Z% P) I3 m* F/ W e
// $font=6;
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// $x=rand(5,10)+$i*100/4;/ b* k# @2 @$ _- W$ i: @
// $y=rand(8, 15);3 {9 Z7 d" N/ p0 |5 R
// $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);
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// }! p' O+ G* V6 w; Y3 d8 _
$code='';, |, Y- _: U9 }& g$ M; Y
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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$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';1 v, c/ l6 I4 S
$string=substr($data,rand(0, strlen($data)),1);
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$code.=$string;
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// 3.2 加载自定义字体
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$font_file = '1.ttf';' x3 d/ r w6 e; U2 H- p
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));
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// 把文字填充到画布
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//imagefttext($image, 10, mt_rand(-5, 10), $x, $y, $color, $font_file, $string);* s; { p/ n$ P z# Q- V
imagestring($image, $fontSize, $x, $y, $string, $color);
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}
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$_SESSION['code']=$code;//存储在session里! P+ D. s1 R& A S+ z8 X' w
for($i=0;$i<200;$i++){
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$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));
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imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);
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for($i=0;$i<2;$i++){6 b: u1 h" x# M1 f
$linePoint=imagecolorallocate($image, rand(150, 255), rand(150, 255), rand(150, 255));/ R( Q- r. f: |. F# d' p5 z" T, x/ M
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);
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imagedestroy($image);8 X2 n$ ?+ R- J+ U/ G& X/ c
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?>

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form.php

<?php9 R: T% P* O7 V" H
if(isset($_REQUEST['code'])){+ z4 W5 D2 K0 y6 r1 q) n) R7 X
session_start();
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if($_REQUEST['code']==$_SESSION['code']){
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echo "<font color='red'>输入正确</font>";3 T" i1 K& [3 r( i0 o! ?
}else{
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echo "<font color='red'>输入错误</font>";
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}
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}
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?>
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<!DOCTYPE html>
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<html>
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<head>
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<meta chartset="UTF-8" />
<style type="text/css" rel="stylesheet">
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a{
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text-decoration:none;) Q1 L/ G Y3 Z
font-size:30px;
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color:blue;
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}
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a:hover{
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text-decoration:underline;
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}
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</style>4 |8 Q: D( h+ c/ |7 u f8 [
</head>
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<body>% H6 Y1 a/ g, ^
<form action="form.php" method="get">
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验证码: <img id="img" src="index.php?" onclick="changeCode()"/>, S& L* d5 m3 n. `
<a href="javascript:void(0)" onclick="changeCode()">看不清?</a> <br /># ?) |3 m' x5 `6 \9 e; ^0 L
请输入验证码: <input name="code" /><br />
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<input type="submit" value="提交" />0 t1 B$ e7 _0 T5 l3 r
</form>6 ?" M! O7 y6 z, G7 f& J6 I5 j2 Q7 I
</body>
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<script type="text/javascript">7 @# s, _! p+ C
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function changeCode(){8 ?' {9 E: S% y Z- `6 Q
var img=document.getElementById('img');1 s7 _( f4 c( A$ i# P+ @
//img.src='index.php?r='+Math.random();% P' }8 H; U4 h7 a S) u
img.setAttribute('src','index.php?r='+Math.random());$ M0 [* W3 I, n4 L( j
}
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</script> W: A, ]& M; }& w7 D! D
</html>

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