比如你用PHP开发了网站的会员登录页面，当然要实现验证码，验证码的图片可以是静态的，也可以是动态的，文字可以是汉字，英文，法文，日文等等，可以随便替换。如验证码图片：
：
当然可以修改，只是要导入PHP源代码才可以实现
代码如下：
01. <?php
02. class Imagecode{
03. private $width ;
04. private $height;
05. private $counts;
06. private $distrubcode;
07. private $fonturl;
08. private $session;
09. function __construct($width = 120,$height = 30,$counts = 5,$distrubcode="1235467890qwertyuipkjhgfdaszxcvbnm",$fonturl="C:\Windows\Fonts\TektonPro-BoldCond.otf"){
10. $this->width=$width;
11. $this->height=$height;
12. $this->counts=$counts;
13. $this->distrubcode=$distrubcode;
14. $this->fonturl=$fonturl;
15. $this->session=$this->sessioncode();
16. session_start();
17. $_SESSION['code']=$this->session;
18. }
19.
20. function imageout(){
21. $im=$this->createimagesource();
22. $this->setbackgroundcolor($im);
23. $this->set_code($im);
24. $this->setdistrubecode($im);
25. ImageGIF($im);
26. ImageDestroy($im);
27. }
28.
29. private function createimagesource(){
30. return imagecreate($this->width,$this->height);
31. }
32. private function setbackgroundcolor($im){
33. $bgcolor = ImageColorAllocate($im, rand(200,255),rand(200,255),rand(200,255));//±³¾°ÑÕÉ«
34. imagefill($im,0,0,$bgcolor);
35. }
36. private function setdistrubecode($im){
37. $count_h=$this->height;
38. $cou=floor($count_h*2);
39. for($i=0;$i
40. $x=rand(0,$this->width);
41. $y=rand(0,$this->height);
42. $jiaodu=rand(0,360);
43. $fontsize=rand(8,15);
44. $fonturl=$this->fonturl;
45. $originalcode = $this->distrubcode;
46. $countdistrub = strlen($originalcode);
47. $dscode = $originalcode[rand(0,$countdistrub-1)];
48. $color = ImageColorAllocate($im, rand(40,140),rand(40,140),rand(40,140));
49. imagettftext($im,$fontsize,$jiaodu,$x,$y,$color,$fonturl,$dscode);
50.
51. }
52. }
53. private function set_code($im){
54. $width=$this->width;
55. $counts=$this->counts;
56. $height=$this->height;
57. $scode=$this->session;
58. $y=floor($height/2)+floor($height/4);
59. $fontsize=rand(30,35);
60. $fonturl="C:\Windows\Fonts\AdobeGothicStd-Bold.otf";//$this->fonturl;
61.
62. $counts=$this->counts;
63. for($i=0;$i
64. $char=$scode[$i];
65. $x=floor($width/$counts)*$i+8;
66. $jiaodu=rand(-20,30);
67. $color = ImageColorAllocate($im,rand(0,50),rand(50,100),rand(100,140));
68. imagettftext($im,$fontsize,$jiaodu,$x,$y,$color,$fonturl,$char);
69. }
70.
71.
72.
73. }
74. private function sessioncode(){
75. $originalcode = $this->distrubcode;
76. $countdistrub = strlen($originalcode);
77. $_dscode = "";
78. $counts=$this->counts;
79. for($j=0;$j
80. $dscode = $originalcode[rand(0,$countdistrub-1)];
81. $_dscode.=$dscode;
82. }
83. return $_dscode;
84.
85. }
86. }
87. Header("Content-type: image/GIF");
88. $imagecode=new Imagecode(160,50);
89. $imagecode->imageout();
do happy!