使用php实现加减法验证码

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

<?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 + $this -> JianShu; } public fun<p style="color:transparent">。本文来源gao!%daima.com搞$代*!码网1</p><cite>搞代gaodaima码</cite>ction 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');

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