PHP制作验证码

你的名字 2022-08-13 00:58 243阅读 0赞

[PHP制作验证码详细教程][PHP]

效果：

![SouthEast][]

myvcode.class.php：封装创建验证码的类

1: <?php

2: /*

3: * file:myvcode.class.php

4: * 验证码类,类名Vcode

5: */

6: class Vcode

7: {

8:     private $width;              /*验证码宽度*/

9:     private $height;             /*验证码高度*/

10:     private $codeNum;            /*验证码字符个数*/

11:     private $checkCode;            /*验证码字符*/

12:     private $image;                /*验证码资源*/

13:     private $pixNum;            /*绘制干扰点的个数*/

14:     private $lineNum;            /*绘制干扰线的条数*/

15:

16:     /*

17:     *构造方法实例化验证码对象，并初始化数据

18:     *@param int $width         设置默认宽度

19:     *@param int $height     设置默认高度

20:     *@param int $codeNum    设置验证码中的字符个数

21:     *@param int $pixNum        设置干扰点的个数

22:     *@param int $lineNum    设置干扰线的数量

23:     */

24:     function __construct($width=80,$height=40,$codeNum=4,$pixNum=40,$lineNum=5)

25:     {

26:         $this->width = $width;

27:         $this->height = $height;

28:         $this->codeNum = $codeNum;

29:         $this->pixNum = $pixNum;

30:         $this->lineNum = $lineNum;

31:     }

32:     /*内部私有方法,创建图像资源*/

33:     private function getCreateImage()

34:     {

35:         $this->image = imagecreatetruecolor($this->width, $this->height);

36:         $white = imagecolorallocate($this->image,0xff,0xff,0xff);

37:         imagefill($this->image, 0, 0, $white);

38:         $black = imagecolorallocate($this->image,0,0,0);

39:         imagerectangle($this->image, 0, 0, $this->width-1, $this->height-1, $black);

40:     }

41:     /*内部私有方法,绘制字符，去掉o0Llz和012*/

42:     private function createCheckCode()

43:     {

44:         $code = '3456789abcdefghijkmnpqrstuvwxyABCDEFGHIJKMNPQRSTUVWXY';

45:         $this->checkCode = "";

46:         for($i=0; $i<$this->codeNum;$i++)

47:         {

48:             $char = $code{rand(0,strlen($code) - 1)};

49:             $this->checkCode .= $char;

50:             $fontColor = imagecolorallocate($this->image, rand(0,128), rand(0,128),rand(0,128));

51:             $fontSize = rand(3,5);

52:             $x = rand(0,$this->width-imagefontwidth($fontSize));

53:             $y = rand(0,$this->height-imagefontheight($fontSize));

54:             imagechar($this->image, $fontSize, $x, $y, $char, $fontColor);

55:         }

56:     }

57:     /*内部私有方法设置干扰元素*/

58:     private function setDisturbColor()

59:     {

60:         /*绘制干扰点*/

61:         for($i=0; $i<$this->pixNum; $i++)

62:         {

63:             $color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));

64:             imagesetpixel($this->image, rand(1,$this->width-2), rand(1,$this->height-2), $color);

65:         }

66:         /*绘制干扰线*/

67:         for($i=0; $i<$this->lineNum; $i++)

68:         {

69:             $color = imagecolorallocate($this->image, rand(0,255), rand(0,255), rand(0,255));

70: imageline($this->image, rand(1,$this->width / 2), rand(1,$this->height / 2),

> rand($this->width / 2,$this->width – 2), rand($this->height / 2,$this->height – 2), $color);

71:         }

72:     }

73:     /*开启session保存 利用echo 输出图像*/

74:     function __toString()

75:     {

76:         $_SESSION['code'] = strtoupper($this->checkCode);

77:         $this->getCreateImage();

78:         $this->createCheckCode();

79:         $this->setDisturbColor();

80:         $this->outputImg();

81:     }

82:     /*内部私有方法输出图像*/

83:     private function outputImg()

84:     {

85:         header("content-type:image/png");

86:         imagepng($this->image);

87:     }

88:     /*析构方法，释放对象*/

89:     function __destruct()

90:     {

91:         imagedestroy($this->image);

92:     }

93: }

94: ?>

imgcode.php输出图像

1: <?php

2: session_start();

3: require_once('myvcode.class.php');

4: echo new Vcode();

5: ?>

test.html:同过img标签引用

1: <img src="imgcode.php">

可以加一个a标签，用js实现换一张效果：

/*局部刷新换验证码*/
    function changeCode()
    {
    	var imgcode = document.getElementById('code');
    	var change = document.getElementById('change');
    	change.onclick = function()
    	{
    		/*必须加后面的参数才能刷新*/
    		imgcode.src='code.php?tm'+Math.random();
    	}
    }

code和change分别是img和a的id

[PHP]: http://www.ido321.com/936.html
[SouthEast]: /images/20220810/e93c3a871a3b4f6081e84ef9f80aea41.png