驗證碼類，php驗證碼類
熟悉相關圖像處理函數，簡單的驗證碼類
1 //code class
2 class ValidateCode {
3 private $charset = 'abcdefghkmnprstuvwxyzABCDEFGHKMNPRSTUVWXYZ23456789'; //random effects
4 private $code; //code
5 private $codelen = 4 ; //code length
6 private $width = 130; //width
7 private $heigth = 50; //height
8 private $img; //image handle
9 private $font; //font file
10 private $fontsize = 20; //font size
11 private $fontcolor; //font color
12
13 //the construct initialization
14 public function __construct(){
15 $this->font = ROOT_PATH.'/font/elephant.ttf';
16 }
17
18 //create random code from $charset
19 private function createCode(){
20 $_len = strlen($this->charset);
21 for($i=1;$i<=$this->codelen;$i++){
22 $this->code .= $this->charset[mt_rand(0,$_len)];
23 }
24 }
25
26 //create background
27 private function createBg(){
28 $this->img = imagecreatetruecolor($this->width, $this->heigth);
29 $_color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
30 imagefilledrectangle($this->img,0,0,$this->width,$this->heigth,$_color);
31 }
32
33 //create font
34 private function createFont(){
35 $_x = $this->width / $this->codelen;
36 for($i=0;$i<$this->codelen;$i++){
37 $this->fontcolor = imagecolorallocate($this->img, mt_rand(0,156), mt_rand(0,156), mt_rand(0,156));
38 imagettftext($this->img, $this->fontsize, mt_rand(-30,30), $_x*$i+mt_rand(1,5), $this->heigth/1.4, $this->fontcolor, $this->font, $this->code[$i]);
39 }
40 }
41
42 //create line,snowflake
43 private function createLine(){
44 for($i=0;$i<6;$i++){
45 $_color = imagecolorallocate($this->img, mt_rand(0,156), mt_rand(0,156), mt_rand(0,156));
46 imageline($this->img, mt_rand(0,$this->width), mt_rand(0, $this->heigth),mt_rand(0,$this->width), mt_rand(0, $this->heigth), $_color);
47 }
48 for($i=0;$i<100;$i++){
49 $_color = imagecolorallocate($this->img, mt_rand(157,255), mt_rand(157,255), mt_rand(157,255));
50 imagestring($this->img, mt_rand(1, 5), mt_rand(0,$this->width), mt_rand(0,$this->heigth), '*', $_color);
51 }
52 }
53
54 //export image
55 private function outPut(){
56 header('Content-type:image/png');
57 imagepng($this->img);
58 imagedestroy($this->img);
59 }
60
61 //display
62 public function doimg(){
63 $this->createBg();
64 $this->createCode();
65 $this->createLine();
66 $this->createFont();
67 $this->outPut();
68 }
69
70 //get code
71 public function getCode(){
72 return strtolower($this->code);
73 }
74
75 }
76
