這篇文章主要介紹了php實現的加減法驗證碼代碼，可以使用10以內的加減法生成圖片,需要的朋友可以參考下
代碼如下: <?php /*圖片驗證碼文件，加減計算方式*/ class ImageCode{ private $Jiashu = 0; //加數或者減數 private $JianShu = 0; //被加數或者被減數 private $YunSuan = ''; //運算符 private $DeShu = 0; //得數 private $String = ''; //字符串樣式 private $Img; //圖片對象 private $Width = 100; //圖片寬度 private $Height = 50; //圖片高度 private $Ttf = 'Num.ttf';//字體文件 private $Session = 'code'; //Session變量 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');
