Understanding and comparing new features of 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 //PHP7 define('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; // 0 echo 1 <=> 2; // -1 echo 2 <=> 1; // 1 //浮点数 echo 1.5 <=> 1.5; // 0 echo 1.5 <=> 2.5; // -1 echo 2.5 <=> 1.5; // 1 //字符串 echo "a" <=> "a"; // 0 echo "a" <=> "b"; // -1 echo "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

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

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

discount; } } class Goods{ private $price = 200; private $objectVipUser; //User接口VipUser类实现 public function getUserData($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

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

attribute; }; $getAttribute = $getClosure->bindTo(new A, 'A');//中间层闭包 echo $getAttribute();//hello world

attribute; }; echo $getClosure->call(new A);//hello world

 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" }

var_dump(IntlChar::CODEPOINT_MAX);//int(1114111) echo '
'; var_dump(IntlChar::charName('+'));//string(9) "PLUS SIGN" echo '
'; var_dump(IntlChar::ispunct('?'));//bool(true)

$bytes = random_bytes(8); echo(bin2hex($bytes));//随机2073a110a2e3c497 echo '
'; echo(random_int(1, 999));//随机786 echo '
'; print(random_int(-999, -1));//随机-357

//PHP7之前 use some\namespace\ClassA; use some\namespace\ClassB; use some\namespace\ClassC as C; use function some\namespace\fn_a; use function some\namespace\fn_b; use function some\namespace\fn_c; use const some\namespace\ConstA; use const some\namespace\ConstB; use const some\namespace\ConstC; // PHP7之后 use some\namespace\{ClassA, ClassB, ClassC as C}; use function some\namespace\{fn_a, fn_b, fn_c}; use const some\namespace\{ConstA, ConstB, ConstC};

echo intp(8,4);//2 echo intp(10,4);//2 echo intp(5,10);//0

PHP7 改变了大多数错误的报告方式.不同于PHP5的传统错误报告机制,现在大多数错误被作为Error异常抛出.

这种Error异常可以像普通异常一样被try / catch块所捕获. 如果没有匹配的try / catch块,则调用异常处理函数（由 set_exception_handler() 注册）进行处理. 如果尚未注册异常处理函数,则按照传统方式处理：被报告为一个致命错误（Fatal Error）.

Error类并不是从Exception类扩展出来的,所以用catch (Exception $e) { ... } 这样的代码是捕获不到Error的.你可以用 catch (Error $e) { ... } 这样的代码， 或者通过注册异常处理函数（ set_exception_handler()）来捕获Error.

getMessage().'
错误的代码'.$this->getCode(); } } try { $num =10; if($num > 1) { throw new getException($num,404); } } catch (getException $e) { echo $e->errorMsg(); }

getMessage();//Call to undefined function test() }