<?php
declare(strict_types = 1);
//declare(strict_types=1);//php7严格模式,只规定当前文件使用严格模式
//function test(string/int/Obj/array):void/int/?int//返回值和参数可指定类型
/*
function test(string $a,int $b,Obj $obj,array $arr,boolean $boo):?int{
  if($boo === true){
      return 1;
  }else{
      return null;
  }
}
*/
class Province
{
    private $pid;
    private $name;
    private $citses = [];

    public function getInfo(): string
    {
        return "pid:" . $this->pid . ",name:" . $this->name;
    }

    public function __construct(int $pid , string $name)
    {
        $this->pid = $pid;
        $this->name = $name;
    }

    public function setCity(array $citses)
    {
        $this->citses = $citses;
    }

    /**
     * 返回城市数组
     * @return array
     * @author zlbao<276363733@QQ.com>
     * @date   : 2018/10/22/022
     */
    public function getCity(): array
    {
        return $this->citses;
    }
}

class City
{
    private $cid;
    private $name;
    private $province;

    public function getInfo(): string
    {
        return "cid: $this->cid  ,name:  $this->name";
    }

    public function __construct(int $cid , string $name)
    {
        //        echo $cid;echo $name;
        $this->cid = $cid;
        $this->name = $name;
        //        echo $this->name;
    }

    /**
     * 设置省份
     * @param Province $province
     * @author zlbao<276363733@QQ.com>
     * @date   : 2018/10/22/022
     */
    public function setProvince(Province $province)
    {
        $this->province = $province;
    }

    public function getProvince(): array
    {
        return $this->province;
    }
}

//设置数据
$c1 = new City(1 , "呼和浩特");
$c2 = new City(2 , "包头");
$c3 = new City(3 , "巴盟");

$p = new Province(1 , "内蒙古");

//设置关系
$c1->setProvince($p);
$c2->setProvince($p);
$c3->setProvince($p);

$p->setCity([$c1 , $c2 , $c3]);
//获取数据
echo $c1->getInfo();
echo $c2->getInfo();
echo $c3->getInfo();

echo $p->getInfo();
for( $i = 0; $i < count($p->getCity()); $i++ ) {
    echo $p->getCity()[$i]->getInfo() . '-----';
}

var_dump($p);

function sum(int $a , int $b): float
{
    return $a + $b;
}

var_dump(sum(1 , 2));
//-------------------------------
//class interface trait abstract
class Person{
    private $namge;
    private $age;
    private $gender;
}
abstract class Player extends Person{
    public abstract function learn();
}
abstract class Cocah extends Person{
    public abstract function teach();
}
interface LearnEn{
    public function learnEn();
}
trait LearnMath{
    public function learnMath(){
        echo "learn Math";
    }
}
class BasketballPlayer extends Player implements LearnEn{
    use LearnMath;//使用trait
    public function learn(){
        echo 'learn basketball';
    }
    //使用interface
    public function learnEn(){
        echo 'learn en';
    }
}
class BasketballCocah extends Cocah implements LearnEn{
    use LearnMath;//使用trait
    public function teach(){
        echo 'teach basketball';
    }
    //使用interface
    public function learnEn(){
        echo 'learn en';
    }
}
$bbp = new BasketballPlayer();
$bbp->learn();
$bbp->learnEn();
$bbp->learnMath();

$bbt = new BasketballCocah();
$bbt->teach();
$bbt->learnEn();
$bbt->learnMath();