PHP implements addition and subtraction verification code code_PHP tutorial

Copy code The code is as follows:

/*Image verification code file, addition and subtraction calculation method */

class ImageCode{

private $Jiashu = 0; //Addend or subtrahend
private $JianShu = 0; //Addend or minuend
private $YunSuan = ''; //Operator
private $DeShu = 0; //Result number
private $String = ''; //String style
private $Img; $Width = 100; //Picture width
private $Height = 50; //Picture 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);
$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');

http://www.bkjia.com/PHPjc/825253.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/825253.htmlTechArticleCopy the code as follows: ?php /*Image verification code file, addition and subtraction calculation method*/ class ImageCode{ private $Jiashu = 0; //addend or subtractor private $JianShu = 0; //addend or subtractor...