Php verification code Image program

<? Php verification code Image program
/*
* File name: class. safeCode. php
* Class name: safeCode
* Purpose: to generate a verification code image for a web application
* Current version: 1.0.2
* Author: NoAngels
* Contact: flare_1023@163.com QQ: 82535599 MSN: atizu@hotmail.com
* Development Date: July 15, June 20, 2008
* Last Updated: July 15, June 21, 2008
* Update content:
* Version 1.0.2
* 1. Updated support for linux hosts and set the GDFONTPATH environment variable,
* Putenv ('gdfontpath = '. realpath ('.'));
* 2. Avoid using this method when the antialias function is not supported. Avoid using the GD library of earlier versions.
* Version 1.0.1
* 1. Updated the image of the specified type. Supported types include: png, jpeg, and gif. The default value is png (the best effect)
* 2. Optimized some code.
*/
Class safeCode {
Function _ construct (){
# Set the default safe security protection code
$ This->__ safe = substr (md5 (time (), 0, 4 );
        }
Function _ destruct (){
# Releasing resources
Unset ($ this->__ img, $ this->__ canvasWidth, $ this->__ canvasHeight, $ this->__ codeLength, $ this->__ spacePerChar, $ this->__ code, $ this->__ safe, $ this->__ background, $ this->__ borderColor, $ this->__ colors, $ this->__ font, $ this->__ sessionName );
        }
Function setCanvas ($ width = 200, $ height = 60 ){
# Set the canvas width and height. Default values are available.
$ This->__ canvasWidth = $ width;
$ This->__ canvasHeight = $ height;
$ This->__ img = imagecreatetruecolor ($ width, $ height );
Return;
        }
Function setSafe ($ char ){
# Set the security code. If the security code is not called, the system will set it by itself.
$ This->__ safe = $ char;
Return;
        }
Function setCodeLength ($ num = 8 ){
# Set the verification code length
$ This->__ codeLength = $ num;
        }       
Function setFont ($ fontName ){
# Set the font used for drawing. The font file must be in the same directory as the class file.
$ This->__ font = $ fontName;
Return;
        }
Function setBackground ($ arg1 = 255, $ arg2 = 255, $ arg3 = 255 ){
# Set the background color
$ This->__ background = imagecolorallocate ($ this->__ img, $ arg1, $ arg2, $ arg3 );
Return;
        }
Function setBorderColor ($ arg1 = 128, $ arg2 = 128, $ arg3 = 128 ){
# Set the border color
$ This->__ borderColor = imagecolorallocate ($ this->__ img, $ arg1, $ arg2, $ arg3 );
        }
Function setFontColor ($ arr ){
# Set the color used for plotting. The parameter is an array of colors.
Foreach ($ arr as $ color ){
$ This->__ colors [] = imagecolorallocate ($ this->__ img, $ color [0], $ color [1], $ color [2]);
                }
Return;
        }       
Function setSession ($ sessionName = 'safecode '){
# Set the session variable name. The default value is $ _ SESSION ['safecode'].
$ This->__ sessionName = $ sessionName;
# $ _ SESSION [$ sessionName] = $ this->__ code;
Return;
        }
Function display ($ type = 'PNG '){
# Display image. The Display type can be specified. Currently, png (default), jpeg, and gif are supported.
$ This->__ setSpacePerChar ();
Imagefilledrectangle ($ this->__ img, 1, 1, $ this->__ canvasWidth-2, $ this->__ canvasHeight-2, $ this->__ background );
Imagerectangle ($ this->__ img, 0, 0, $ this->__ canvasWidth-1, $ this->__ canvasHeight-1, $ this->__ borderColor );
$ This->__ drawText ($ this->__ colors, $ this->__ getCode (), $ this->__ font );
# Fixed linux and earlier version GD Library problems
If (function_exists (imageantialias )){
Imageantialias ($ this->__ img, true );
                }
$ _ SESSION [$ this->__ sessionName] = $ this->__ code;
Switch ($ type ){
Case 'PNG ':
Header ('content-type: image/png ');
Imagepng ($ this->__ img );
Case 'jpeg ':
Header ('content-type: image/jpeg ');
Imagejpeg ($ this->__ img, '', 75 );
Case 'GIF ':
Header ('content-type: image/gif ');
Imagegif ($ this->__ img );
Default:
Header ('content-type: image/png ');
Imagepng ($ this->__ img );
                }
Imagegif ($ this->__ img );
        }       
Private function _ setSpacePerChar (){
# Private Function, set the character interval
$ This->__ spacePerChar = $ this->__ canvasWidth/$ this->__ codeLength;
Return;
        }
Private function _ getCode (){
# Obtain the verification code
$ This->__ code = substr (md5 (time (). $ this->__ safe), rand (0, 24), $ this->__ codeLength );
Return $ this->__ code;
        }
Private function _ drawText ($ colors, $ code, $ fontName ){
# Start plotting
# Set GBFONTPATH to the current directory. Otherwise, an error will be reported in linux.
Putenv ('gdfontpath = '. realpath ('.'));
For ($ I = 0; $ I <strlen ($ code); $ I ++ ){
$ Color = $ colors [$ I % count ($ colors)];
Imagettftext (
$ This->__ img,
24 + rand (0, 8 ),
-20 + rand (0, 40 ),
($ I + 0.3) * $ this->__ spacePerChar,
$ This->__ canvasHeight-20 + rand (0, 20 ),
$ Color,
$ FontName,
$ Code {$ I}
);
                }
# Drawing random solid lines
For ($ I = 0; I I <400; $ I ++ ){
$ X1 = rand (5, $ this->__ canvasWidth-5 );
$ Y1 = rand (5, $ this->__ canvasHeight-5 );
$ X2 = $ x1-4 + rand (0, 8 );
$ Y2 = $ y1-4 + rand (0, 8 );
Imageline ($ this->__ img, $ x1, $ y1, $ x2, $ y2, $ this->__ colors [rand (0, count ($ this->__ colors)-1)]);
                }
Return;
        }
Private $ __img = NULL;
Private $ __canvaswidth = 120;
Private $ __canvasheight = 80;
Private $ __codelength = 8;
Private $ __spaceperchar = 0;
Private $ __code = 12345678;
Private $ __safe = 2008;
Private $ __background = NULL;
Private $ __bordercolor = NULL;
Private $ __colors = array ();
Private $ __font = 'Arial. Ttf ';
Private $ __sessionname = '';
}
?>

Usage.

<? Php
# Test File
Include_once ('class. safeCode. Php ');
Session_start ();
$ SafeCode = new safeCode;
$ SafeCode-> setCanvas (200, 50 );
$ SafeCode-> setCodeLength (8 );
$ SafeCode-> setSafe ('000000'); # sets the security code. If no default value is set, it is dynamically generated.
$ SafeCode-> setBackground ();
$ SafeCode-> setBorderColor ();
$ SafeCode-> setFont ('Arial. Ttf'); # set the font. It must be in the same directory. The font file
$ Colors = array (128, 64,192), array (192, 64,128), array (108,192, 64 ));
$ SafeCode-> setFontColor ($ colors );
$ SafeCode-> setSession ();
$ SafeCode-> display ('jpeg ');

?>