Parlons de la compréhension et de la comparaison des nouvelles fonctionnalités de php7

//php7以前  if判断if(empty($_GET['param'])) {
      $param = 1;
}else{
    $param = $_GET['param'];
}//php7以前  三元运算符$param = empty($_GET['param']) ? 1 : $_GET['param'];//PHP7  null合并运算符$param = $_GET['param'] ?? 1;//1

//php7以前define("CONTENT", "hello world");echo CONTENT;//hello world//PHP7define('ANIMALS', [    'dog',    'cat',    'bird']);echo ANIMALS[2];//bird//PHP7 类外也可使用const来定义常量const CONSTANT = 'Hello World'; 
echo CONSTANT;//Hello World

//整数echo 1 <=> 1; // 0echo 1 <=> 2; // -1echo 2 <=> 1; // 1//浮点数echo 1.5 <=> 1.5; // 0echo 1.5 <=> 2.5; // -1echo 2.5 <=> 1.5; // 1
 //字符串echo "a" <=> "a"; // 0echo "a" <=> "b"; // -1echo "b" <=> "a"; // 1

//... 操作符: 表示这是一个可变参数. php5.6及以上的版本可使用: 函数定义的时候变量前使用.function intSum(int ...$ints){    return array_sum($ints);
}
var_dump(intSum(2,'3.5'));//5//严格模式//模式声明：declare(strict_types=1);  默认情况值为0，值为1代表为严格校验的模式 declare(strict_types=1);function add(int $a,int $b){    return $a+$b;
}
var_dump(add(2,'3.5')); //Fatal error: Uncaught TypeError: Argument 2 passed to add() must be of the type integer

1 //有效的返回类型2 declare(strict_types = 1);3 function getInt(int $value): int {4   return $value;5 }6 print(getInt(6));//6

1 //无效返回类型2 declare(strict_types = 1);3 function getNoInt(int $value): int {4   return $value+'2.5';5 }6 print(getNoInt(6));//Fatal error: Uncaught TypeError: Return value of getNoInt() must be of the type integer

<?php//php7以前 接口实现interface User{    public function getDiscount();
}class VipUser implements User{    //折扣系数
    private $discount = 0.6;    public function getDiscount() {        return $this->discount;
    }
}class Goods{    private $price = 200;    private $objectVipUser;    //User接口VipUser类实现
    public function getUserData(User $User){        $this->objectVipUser = $User;
        $discount = $this->objectVipUser->getDiscount();        echo "商品价格:".$this->price*$discount;
    }
}
$display = new Goods();//常规实例化接口实现对象$display->getUserData(new VipUser);//商品价格:120

<?php//php7 创建一个匿名的对象interface User{    public function getDiscount();
}class Goods{    private $price = 200;    private $objectVipUser;    public function getUserData($User){        $this->objectVipUser = $User;
        $discount = $this->objectVipUser->getDiscount();        echo "商品价格:".$this->price*$discount;
    }
}
$display = new Goods();//new匿名对象实现user接口$display->getUserData(new class implements User{    private $discount = 0.6;    public function getDiscount() {        return $this->discount;
    }
});//商品价格:120

<?php//php7以前class A {    private  $attribute = &#39;hello world&#39;;
}

$getClosure = function(){    return $this->attribute;
};

$getAttribute = $getClosure->bindTo(new A, &#39;A&#39;);//中间层闭包echo $getAttribute();//hello world

<?php//PHP7class A {    private  $attribute = &#39;hello world&#39;;
}

$getClosure = function(){    return $this->attribute;
};echo $getClosure->call(new A);//hello world

<?php class A{  
   public $name = &#39;admin_a&#39;;    
} 
class B{ 
   public $name = &#39;admin_b&#39;; 
} 

$objA = new A(); 
$objB = new B(); 

$serializedObjA = serialize($objA); 
$serializedObjB = serialize($objB); 


//默认行为是接收所有类; 第二个参数可以忽略$dataA = unserialize($serializedObjA , ["allowed_classes" => true]); 
var_dump($dataA);//object(A)#3 (1) { ["name"]=> string(7) "admin_a" }//如果allowed_classes设置为false,unserialize会将所有对象转换为__PHP_Incomplete_Class对象 $dataA = unserialize($serializedObjA , ["allowed_classes" => false]); 
var_dump($dataA);//object(__PHP_Incomplete_Class)#4 (2) { ["__PHP_Incomplete_Class_Name"]=> string(1) "A" ["name"]=> string(7) "admin_a" }//转换所有对象到 __PHP_Incomplete_Class对象，除了对象"B"$dataB = unserialize($serializedObjB , ["allowed_classes" => ["B"]]); 
var_dump($dataB);//object(B)#3 (1) { ["name"]=> string(7) "admin_b" }

1 var_dump(IntlChar::CODEPOINT_MAX);//int(1114111) 2 echo &#39;<br>&#39;;3 var_dump(IntlChar::charName(&#39;+&#39;));//string(9) "PLUS SIGN" 4 echo &#39;<br>&#39;;5 var_dump(IntlChar::ispunct(&#39;?&#39;));//bool(true)

1 $bytes = random_bytes(8); 
2 echo(bin2hex($bytes));//随机2073a110a2e3c4973 echo &#39;<br>&#39;;4 echo(random_int(1, 999));//随机7865 echo &#39;<br>&#39;;6 print(random_int(-999, -1));//随机-357