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admin · 发表于 2018-12-16 01:00:13

index.php

<?php0 K9 r6 r3 u. y0 B
session_start();: Q8 h* ~' [ S3 M5 M
// 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');! J: ] D8 w0 ?; d: e- b1 P+ {5 y
// 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7 k* ]; H* |0 k9 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++){8 f4 m2 j. f' F3 |
// $font=6;
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// $x=rand(5,10)+$i*100/4;
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// $y=rand(8, 15);# r1 y( Z" a8 ]: p$ v. f$ F9 x 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);& j: V) N9 e A7 j# D( F- N
// }) i1 Y% T8 ]2 H7 G
$code='';
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for($i=0;$i<4;$i++){
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$fontSize=8;) J: E$ [& A1 m
$x=rand(5,10)+$i*100/4;
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$y=rand(5, 15);
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$data='abcdefghijklmnopqrstuvwxyz123456789ABCDEFGHJKLMNPQRTUVWXYZ';
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$string=substr($data,rand(0, strlen($data)),1); h1 n2 z# b3 c1 U4 i- u: M4 v7 |
$code.=$string;
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// 3.2 加载自定义字体
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$font_file = '1.ttf';6 W& I5 @. j3 I+ d+ j9 {8 M
$color=imagecolorallocate($image,rand(0,120), rand(0,120), rand(0,120));5 U, i& h! a. H) S. {0 Q! G
// 把文字填充到画布+ @6 k8 m3 L3 L8 h* B. ?4 Y3 Z! w
//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++){
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$pointColor=imagecolorallocate($image, rand(100, 255), mt_rand(100, 255), rand(100, 255));, X& }0 s8 p8 W" d1 e3 m, V; p
imagesetpixel($image, mt_rand(0, 100), rand(0, 30), $pointColor);# Z# ~; W0 B% ~
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for($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), $linePoint);9 @8 k# t1 f* K, g3 t1 L+ A
}
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imagepng($image);1 c% E" n5 p; L$ g: O* d( {# Z% g5 d
imagedestroy($image);
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?>

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form.php

<?php
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if(isset($_REQUEST['code'])){
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session_start();/ {0 }: S; g2 Y, `9 q, H
if($_REQUEST['code']==$_SESSION['code']){( Z' S2 a& a" B/ E1 n
echo "<font color='red'>输入正确</font>";
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}else{
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echo "<font color='red'>输入错误</font>";: }# V7 }* T$ Q0 ~
}
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<!DOCTYPE html>/ m! ~4 E% ~& N' s
<html>
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<head>5 ] b) n. z8 A8 m5 {
<meta chartset="UTF-8" />6 j# W/ ^5 L" i3 c$ c' z
<style type="text/css" rel="stylesheet">& Q' c+ ^' \/ ?: D8 d4 ^% w
a{
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text-decoration:none; G. X7 B$ {; d6 P+ ^
font-size:30px;
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color:blue;# E; \* {. G) _) v- b
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a:hover{9 \& I3 @5 j) i; X S' P
text-decoration:underline;
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}
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</style>
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</head>
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<body>
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<form action="form.php" method="get"> j9 Q" Q! M" b; {
验证码: <img id="img" src="index.php?" onclick="changeCode()"/>* b1 E5 z$ E ^$ r4 S7 X3 o0 Q
<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>& L! q: A% v9 _5 J8 I7 I
</body>, ]5 k" g, ~* k5 S5 O: s9 W. u
<script type="text/javascript">, y6 F/ f- R0 X5 M
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function changeCode(){
var img=document.getElementById('img');0 s$ p- z4 f* g! l2 ^
//img.src='index.php?r='+Math.random();% k5 r6 T/ v2 E3 j! Q
img.setAttribute('src','index.php?r='+Math.random());
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</script>& @% J9 V6 u, J- {
</html>

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