<?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');
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