Code of the addition/subtraction Verification Code implemented by php

Code of the addition/subtraction Verification Code implemented by php

This article mainly introduces the code of the addition and subtraction Verification Code implemented by php. You can use the addition and subtraction codes of less than 10 to generate images. For more information, see

The Code is as follows:

<? Php

/* Image verification code file, plus or minus Calculation Method */

 

Class ImageCode {

 

Private $ Jiashu = 0; // addition or subtraction

Private $ JianShu = 0; // Add number or subtrahend

Private $ YunSuan = ''; // Operator

Private $ DeShu = 0; // number

Private $ String = ''; // String Style

Private $ Img; // image object

Private $ Width = 100; // Image Width

Private $ Height = 50; // Image Height

Private $ Ttf = 'num. ttf'; // font file

Private $ Session = 'code'; // Session variable

 

Private function JiaShu (){

Header ('content-type: image/png ');

$ This-> Jiashu = rand (1, 10 );

$ This-> JianShu = rand (1, 10 );

$ This-> YunSuan = $ this-> Jiashu> $ this-> JianShu? '-': '+ ';

$ This-> DeShu = $ this-> Jiashu> $ this-> JianShu? $ This-> Jiashu-$ this-> JianShu: $ this-> Jiashu + $ this-> JianShu;

}

 

Public function Show ($ W = 100, $ H = 50, $ T = 'num. ttf', $ Code = 'code '){

$ This-> JiaShu ();

$ This-> String = $ this-> Jiashu. $ this-> YunSuan. $ this-> JianShu. '=? ';

$ This-> Width = $ W;

$ This-> Height = $ H;

$ This-> Ttf = $ T;

$ This-> Session = $ Code;

Session_start ();

$ _ SESSION [$ this-> Session] = $ this-> DeShu;

$ This-> Images ();

}

 

Private function Images (){

$ This-> Img = imagecreate ($ this-> Width, $ this-> Height );

$ Background_color = imagecolorallocate ($ this-> image, 255,255,255 );

Imagecolortransparent ($ this-> Img, $ background_color );

Imagettftext ($ this-> Img, 14, 0, 1, 20, imagecolorallocate ($ this-> Img, 0, 0, 0), $ this-> Ttf, $ this-> String );

$ This-> EchoImages ();

}

 

Private function EchoImages (){

Imagepng ($ this-> Img );

Imagedestroy ($ this-> Img );

}

 

}

 

$ ImageCode = new ImageCode;

$ ImageCode-> Show (130, 35, 'num. ttf', 'code ');