php实现的加减法验证码代码

php实现的加减法验证码代码

 这篇文章主要介绍了php实现的加减法验证码代码，可以使用10以内的加减法生成图片,需要的朋友可以参考下

 代码如下:

<?php

/*图片验证码文件，加减计算方式*/

 

class ImageCode{

 

 private $Jiashu  = 0;        //加数或者减数

 private $JianShu = 0;        //被加数或者被减数

 private $YunSuan = '';       //运算符

 private $DeShu   = 0;        //得数

 private $String  = '';       //字符串样式

 private $Img;                //图片对象

 private $Width   = 100;      //图片宽度

 private $Height  = 50;       //图片高度

 private $Ttf     = 'Num.ttf';//字体文件

 private $Session = 'code';   //Session变量

 

 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 -> Img, 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');