PHP dynamic and random generation of verification code class code _ PHP Tutorial

PHP dynamically generates a random verification code. Below is, this is the interference code that is not enabled. below is the code for copying the class code :? Php *************************************** * ******** FILE: the following figure shows that the interference code is not enabled.

The following is the class code

The code is as follows:

/*************************************** *********
// FILE: ImageCode
// DONE: Dynamic verification code generation class
// DATE "2010-3-31
// Author: www.5dkx.com 5D happy blog
**************************************** ********************************/
Class ImageCode {
Private $ width; // the image width of the verification code.
Private $ height; // The Image height of the verification code
Private $ codeNum; // Number of characters in the verification code
Private $ checkCode; // verification code character
Private $ image; // verification code canvas
/*************************************** *********************************
// Function: constructor
// Done: initialize the member attributes.
// Author: www.5dkx.com 5D happy blog
**************************************** ********************************/
Function _ construct ($ width = 60, $ height = 20, $ codeNum = 4)
{
$ This-> width = $ width;
$ This-> height = $ height;
$ This-> codeNum = $ codeNum;
$ This-> checkCode = $ this-> createCheckCode ();
}
Function showImage ()
{
$ This-> getcreateImage ();
$ This-> outputText ();
$ This-> setDisturbColor ();
$ This-> outputImage ();
}
Function getCheckCode ()
{
Return $ this-> chekCode;
}
Private function getCreateImage ()
{
$ This-> image = imagecreatetruecolor ($ this-> width, $ this-> height );
$ Back = imagecolorallocate ($ this-> image, 255,255,255 );
$ Border = imagecolorallocate ($ this-> image, 255,255,255 );
Imagefilledrectangle ($ this-> image, 0, 0, $ this-> width-1, $ this-> height-1, $ border );
// Fill the rectangular frame with pure white color. if this box is used, the interference code is invalid.
/* If you want to use the interference code, use the following */
// Imagerectangle ($ this-> image, 0, 0, $ this-> width-1, $ this-> height-1, $ border );
}
Private function createCheckCode ()
{
For ($ I = 0; $ I <$ this-> codeNum; $ I ++)
{
$ Number = rand (0, 2 );
Switch ($ number)
{
Case 0: $ rand_number = rand (48, 57); break; // number
Case 1: $ rand_number = rand (); break; // uppercase letter
Case 2: $ rand_number = rand (97,122); break; // lowercase letter
}
$ Asc = sprintf ("% c", $ rand_number );
$ Asc_number = $ asc_number. $ asc;
}
Return $ asc_number;
}
Private function setDisturbColor () // do you want to set interference?
{
For ($ I = 0; $ I <= 100; $ I ++)
{
// $ Color = imagecolorallocate ($ this-> image, rand (0,255), rand (0,255), rand (0,255 ));
$ Color = imagecolorallocate ($ this-> image, 255,255,255 );
Imagesetpixel ($ this-> image, rand (1, $ this-> width-2), rand (1, $ this-> height-2), $ color );
}
// $ Color = imagecolorallocate ($ this-> image, 0, 0 );
// Imagesetpixel ($ this-> image, rand (1, $ this-> width-2), rand (1, $ this-> height-2), $ color );
}
Private function outputText ()
{
// Random color, random placement, and random string output to the image
For ($ I = 0; $ I <= $ this-> codeNum; $ I ++)
{
$ Bg_color = imagecolorallocate ($ this-> image, rand (0,255), rand (0,128), rand (0,255 ));
$ X = floor ($ this-> width/$ this-> codeNum) * $ I + 3;
$ Y = rand (0, $ this-> height-15 );
Imagechar ($ this-> image, 5, $ x, $ y, $ this-> checkCode [$ I], $ bg_color );
}
}
Private function outputImage ()
{
If (imagetypes () & IMG_GIF)
{
Header ("Content_type: image/gif ");
Imagegif ($ this-> image );
}
Elseif (imagetypes () & IMG_JPG)
{
Header ("Content-type: image/jpeg ");
Imagejpeg ($ this-> image, "", 0.5 );
}
Elseif (imagetypes () & IMG_PNG)
{
Header ("Content-type: image/png ");
Imagejpeg ($ this-> image );
}
Elseif (imagetypes () & IMG_WBMP)
{
Header ("Content-type: image/vnd. wap. wbmp ");
Imagejpeg ($ this-> image );
}
Else
{
Die ("PHP does not support Image creation ");
}
}
Function _ destruct ()
{
Imagedestroy ($ this-> image );
}
}
/* Display */
/*************************************** ****************************
Session_start ();
$ Image = new ImageCode (60, 20, 4 );
$ Image-> showImage ();
$ _ SESSION ['imagecode'] = $ image-> getCheckCode ();
**************************************** ***************************/
?>

The following code of the category is as follows :? Php /************************************** * ******** // FILE :...