設計一個驗證碼類，在需要的時候可以隨時調用
驗證碼類，保存為ValidateCode.class.php
1 <?php
2 //驗證碼類
3 session_start();
4 class ValidateCode {
5 private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789';//隨機因子
6 private $code;//驗證碼
7 private $codelen = 4;//驗證碼長度
8 private $width = 130;//寬度
9 private $height = 50;//高度
10 private $img;//圖形資源句柄
11 private $font;//指定的字體
12 private $fontsize = 20;//指定字體大小
13 private $fontcolor;//指定字體顏色
14 //構造方法初始化
15 public function __construct() {
16 $this->font = './latha.ttf';//注意字體路徑要寫對，否則顯示不了圖片
17 }
18 //生成隨機碼
19 private function createCode() {
20 $_len = strlen($this->charset)-1;
21 for ($i=0;$i<$this->codelen;$i++) {
22 $this->code .= $this->charset[mt_rand(0,$_len)];
23 }
24 }
25 //生成背景
26 private function createBg() {
27 $this->img = imagecreatetruecolor($this->width, $this->height);
28 $color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
29 imagefilledrectangle($this->img,0,$this->height,$this->width,0,$color);
30 }
31 //生成文字
32 private function createFont() {
33 $_x = $this->width / $this->codelen;
34 for ($i=0;$i<$this->codelen;$i++) {
35 $this->fontcolor = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
36 imagettftext($this->img,$this->fontsize,mt_rand(-30,30),$_x*$i+mt_rand(1,5),$this->height / 1.4,$this->fontcolor,$this->font,$this->code[$i]);
37 }
38 }
39 //生成線條、雪花
40 private function createLine() {
41 //線條
42 for ($i=0;$i<6;$i++) {
43 $color = imagecolorallocate($this->img,mt_rand(0,156),mt_rand(0,156),mt_rand(0,156));
44 imageline($this->img,mt_rand(0,$this->width),mt_rand(0,$this->height),mt_rand(0,$this->width),mt_rand(0,$this->height),$color);
45 }
46 //雪花
47 for ($i=0;$i<100;$i++) {
48 $color = imagecolorallocate($this->img,mt_rand(200,255),mt_rand(200,255),mt_rand(200,255));
49 imagestring($this->img,mt_rand(1,5),mt_rand(0,$this->width),mt_rand(0,$this->height),'*',$color);
50 }
51 }
52 //輸出
53 private function outPut() {
54 header('Content-type:image/png');
55 imagepng($this->img);
56 imagedestroy($this->img);
57 }
58 //對外生成
59 public function doimg() {
60 $this->createBg();
61 $this->createCode();
62 $this->createLine();
63 $this->createFont();
64 $this->outPut();
65 }
66 //獲取驗證碼
67 public function getCode() {
68 return strtolower($this->code);
69 }
70 }
注意：第16行中，要修改字體的路徑，否則字體圖片無法顯示
實現，保存為captcha.php
1 session_start(); 2 require './ValidateCode.class.php'; //先把類包含進來，實際路徑根據實際情況進行修改。 3 $_vc = new ValidateCode(); //實例化一個對象 4 $_vc->doimg(); 5 $_SESSION['authnum_session'] = $_vc->getCode();//驗證碼保存到SESSION中
頁面使用
<img title="點擊刷新" src="./captcha.php" align="absbottom" onclick="this.src='captcha.php?'+Math.random();"></img>
轉載自：一個漂亮的php驗證碼類(分享)
