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
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');以上就是本文的全部内容，希望对大家的学习有所帮助，更多相关内容请关注PHP中文网！
相关推荐：
立即学习“PHP免费学习笔记（深入）”；
