一款PHP验证码的精心打造

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.

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<$cou;$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<$counts;$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<$counts;$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();

编写完毕，用Dreamweaver编辑器 打开，上传OK。

do happy!