加减 验证码

include "ImageCode.class.php";
$show = new \ImageCode();
$show->show(130, 35, '1.ttf', 'code');

<?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     = '1.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 = '1.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);
}

}