PHP dynamic random Generation Verification Code class Code _php tutorial

Here's the one that doesn't have a jamming code.

The following is the class code

Copy CodeThe code is as follows:
/************************************************
File:imagecode
Done: Generate Dynamic Captcha class
DATE "2010-3-31
author:www.5dkx.com 5D Happy Blog
************************************************************************/
Class imagecode{
Private $width; Verification Code Picture width
Private $height; Verification Code Picture Height
Private $codeNum; Number of verification code characters
Private $checkCode; Verification Code characters
Private $image; Verification Code Canvas
/************************************************************************
Function: Constructor
Done: Member Property initialization
author:www.5dkx.com 5D Happy Blog
************************************************************************/
function __construct ($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, $border);
Use pure white to fill the rectangular box, where the noise code after the failure
/* Use the following * * If you want to use interference codes.
Imagerectangle ($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;//Digital
Case 1: $rand _number = rand (65,90); break;//Capital Letter
Case 2: $rand _number = rand (97,122); break;//lowercase Letter
}
$ASC = sprintf ("%c", $rand _number);
$ASC _number = $asc _number. $asc;
}
return $ASC _number;
}
Private Function Setdisturbcolor ()//interference setting
{
for ($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,0,0,0);
Imagesetpixel ($this->image,rand (1, $this->width-2), rand (1, $this->height-2), $color);
}
Private Function Outputtext ()
{
Random color, random placement, random string to image output
for ($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 ();
*******************************************************************/
?>

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