Using PHP to implement add-subtract verification code

This article mainly introduces the PHP implementation of the code to add and subtract codes, you can use the addition and subtraction within 10 to generate pictures, the need for friends can refer to the following

<?php/* Image Verification code file, add and subtract calculation method */class imagecode{Private $Jiashu = 0;        Addend or meiosis $JianShu = 0;       Summand or $YunSuan = ';        operator private $DeShu = 0;       Private $String = ';                string style private $Img;      Picture Object Private $Width = 100;       Picture 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); Jianshu, Jiashu > $this, yunsuan= $this, $this  '-' : '+'; $this Deshu = Jiashu > $this, $this, Jianshu? jiashu-$this, $this, Jianshu: $this, Jiashu + $this-Jianshu;  Public Function Show ($W = $H =, $T = ' Num.ttf ', $Code = ' Code ') {$this-Jiashu (); $this, String = $this, Jiashu. Yunsuan, $this. Jianshu, $this. '= ?  '; $this Width = $W; $this, Height = $H;  $this, TTF = $T;  $this-session= $Code;  Session_Start ();  $_session[$this, SESSION] = Deshu, $this; $this-Images ();  } Private Function Images () {$this, Img = Imagecreate ($this, Width, $this, Height);  $background _color = imagecolorallocate ($this, IMG, 255, 255, 255);        Imagecolortransparent (Img $this, $background _color); Imagettftext ($this, IMG, 0, 1, imagecolorallocate ($this, IMG, 0, 0, 0), $this, TTF, $this, St  Ring); $this-Echoimages ();  } Private Function Echoimages () {imagepng ($this-IMG); Imagedestroy ($this, IMG); }} $ImageCode = new Imagecode; Show (Num.ttf, ' Code '), $ImageCode

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