Encapsulation of a php verification code

Encapsulation of a php verification code

/** * Verification code * Edit bbs.it-home.org */ Class ValidationCode { Private $ width; Private $ height; Private $ codeNum; Private $ image; // image resources Private $ disturbColorNum; Private $ checkCode; Function _ construct ($ width = 80, $ height = 20, $ codeNum = 4 ){ $ This-> width = $ width; $ This-> height = $ height; $ This-> codeNum = $ codeNum; $ This-> checkCode = $ this-> createCheckCode (); $ Number = floor ($ width * $ height/15 ); If ($ number> 240-$ codeNum ){ $ This-> disturbcolornum= 240-$ codeNum; } Else { $ This-> disturbColorNum = $ number; } } // Output the image to the browser by accessing this method Function showImage ($ fontFace = ""){ // Step 1: create an image background $ This-> createImage (); // Step 2: Set interference elements $ This-> setDisturbColor (); // Step 3: randomly draw text from the image $ This-> outputText ($ fontFace ); // Step 4: output the image $ This-> outputImage (); } // Obtain the randomly created verification code string by calling this method Function getCheckCode (){ Return $ this-> checkCode; } Private function createImage (){ // Create image resources // bbs.it-home.org $ This-> image = imagecreatetruecolor ($ this-> width, $ this-> height ); // Random background color $ BackColor = imagecolorallocate ($ this-> image, rand (225,255), rand (225,255), rand (225,255 )); // Add color to the background Imagefill ($ this-> image, 0, 0, $ backColor ); // Set the border color $ Border = imagecolorallocate ($ this-> image, 0, 0, 0 ); // Draw a rectangular border Imagerectangle ($ this-> image, 0, 0, $ this-> width-1, $ this-> height-1, $ border ); } Private function setDisturbColor (){ For ($ I = 0; $ I <$ this-> disturbColorNum; $ I ++ ){ $ Color = imagecolorallocate ($ this-> image, rand (0,255), rand (0,255), rand (0,255 )); Imagesetpixel ($ this-> image, rand (1, $ this-> width-2), rand (1, $ this-> height-2), $ color ); } For ($ I = 0; $ I <10; $ I ++ ){ $ Color = imagecolorallocate ($ this-> image, rand (200,255), rand (200,255), rand (200,255 )); Imagearc ($ this-> image, rand (-10, $ this-> width), rand (-10, $ this-> height), rand (30,300 ), rand (20,200), 55, 44, $ color ); } } Private function createCheckCode (){ // Here the random code is mainly generated, starting from 2 to distinguish between 1 and l $ Code = "23456789 abcdefghijkmnpqrstuvwxyzABCDEFGHIJKMNPQRSTUVWXYZ "; $ String = ''; For ($ I = 0; $ I <$ this-> codeNum; $ I ++ ){ $ Char = $ code {rand (0, strlen ($ code)-1 )}; $ String. = $ char; } Return $ string; } Private function outputText ($ fontFace = ""){ For ($ I = 0; $ I <$ this-> codeNum; $ I ++ ){ $ Fontcolor = imagecolorallocate ($ this-> image, rand (0,128), rand (0,128), rand (0,128 )); If ($ fontFace = ""){ $ Fontsize = rand (3, 5 ); $ X = floor ($ this-> width/$ this-> codeNum) * $ I + 3; $ Y = rand (0, $ this-> height-15 ); Imagechar ($ this-> image, $ fontsize, $ x, $ y, $ this-> checkCode {$ I}, $ fontcolor ); } Else { $ Fontsize = rand (12, 16 ); $ X = floor ($ this-> width-8)/$ this-> codeNum) * $ I + 8; $ Y = rand ($ fontSize + 5, $ this-> height ); Imagettftext ($ this-> image, $ fontsize, rand (-30, 30), $ x, $ y, $ fontcolor, $ fontFace, $ this-> checkCode {$ I }); } } } // Output image information Private function outputImage (){ If (imagetypes () & IMG_GIF ){ Header ("Content-Type: image/gif "); Imagepng ($ this-> image ); } Else if (imagetypes () & IMG_JPG ){ Header ("Content-Type: image/jpeg "); Imagepng ($ this-> image); // bbs.it-home.org } Else if (imagetypes () & IMG_PNG ){ Header ("Content-Type: image/png "); Imagepng ($ this-> image ); } Else if (imagetypes () & IMG_WBMP ){ Header ("Content-Type: image/vnd. wap. wbmp "); Imagepng ($ this-> image ); } Else { Die ("PHP does not support Image creation "); } } Function _ destruct (){ Imagedestroy ($ this-> image ); } } ?> Call example of the verification code class: Session_start (); Include "validationcode. class. php "; $ Code = new ValidationCode (80, 20, 4 ); $ Code-> showImage (); // output to the page for registration or login $ _ SESSION ["code"] = $ code-> getCheckCode (); // Save the verification code to the server. ?>