PHP7新特性

<?php 
// 强制模式 
function sum(int ...$ints) 
{ 
   return array_sum($ints); 
} 

print(sum(2, ‘3‘, 4.1)); 
?>

//9

<?php 
// 严格模式 
declare(strict_types=1); 

function sum(int ...$ints) 
{ 
   return array_sum($ints); 
} 

print(sum(2, ‘3‘, 4.1)); 
?>

//PHP Fatal error:  Uncaught TypeError: Argument 2 passed to sum() must be of the type integer, string given, called in……

<?php 
declare(strict_types=1); 

function returnIntValue(int $value): int 
{ 
   return $value; 
} 

print(returnIntValue(5)); 
?>

$site = isset($_GET[‘site‘]) ? $_GET[‘site‘] :‘python‘;

==>

$site = isset($_GET[‘site‘]) ?? ‘python‘;

<?php
print(1<=>1);
print(1<=>2);
print(2<=>1);
?>

//0 -1 1

<?php
define(‘sites‘, [
    ‘Google‘,
    ‘Runoob‘,
    ‘Taobao‘
]);

?>

<?php
class A {
    private $x = 1;
}

//PHP7之前版本定义闭包函数代码
$getXCB = function() {
    return $this->x;
};

//闭包函数绑定到类A上
$getX = $getXCB->bindTo(new A, ‘A‘);

echo $getX();
print(PHP_EOL);

//PHP 7+ 代码
$getX = function() {
    return $this->x;
};
echo $getX->call(new A);
?>

//闭包函数
<?php
function callback($callback) {
    $callback();
}

$var = ‘字符串‘;

callback(function() use (&$var){
    echo "闭包函数传参数测试{$var}";
    $var = 1;
});
print($var);
?>

<?php
class MyClass1 {
    public $obj1prop;
}

class MyClass2 {
    public $obj2prop;
}

$obj1 = new MyClass1();
$obj1->obj1prop = 1;
$obj2 = new MyClass2();
$obj2->obj2prop = 2;

$serializedObj1 = serialize($obj1);
$serializedObj2 = serialize($obj2);

//默认行为是接收所有类，第二个参数可以忽略
//如果allowed_classes 设置为false，unserialize会将所有对象转换为__PHP_Incomplete_Class对象
$data = unserialize($serializedObj1, ["allowed_classes"=>true]);

//转换所有对象到__PHP_Incomplete_Class对象
$data2 = unserialize($serializedObj2, ["allowed_classes"=>["MyClass1", "MyClass2"]]);
print($data->obj1prop);
echo "<br>";
print($data2->obj2prop);


?>

<?php
//string random_bytes(int $length)
//@param  length-随机字符串返回的字节数
//@return  返回一个字符串，接受一个int型入参代表返回结果的字节数

$bytes = random_bytes(5);
//print($bytes);
print(bin2hex($bytes));

//int random_int (int $min, int $max)
//@param min 返回的最小值，必须是大于或等于PHP_INT_MIN
//@param max 返回的最大值，必须是小于或等于PHP_INT_MAX
//@return 返回一个指定范围内的int型数字

print(random_int(100, 999));
print(random_int(-1000, 0));
?>

<?php
class MathOperations
{
    protected $n = 10;

    //求余数运算，除数为0，抛出异常
    public function doOperation(): string
    {
        try
        {
            $value = $this->n % 0;
            return $value;
        } catch (DivisionByZeroError $e)
        {
            return $e->getMessage();
        }
    }
}

$mathOperationsObj = new MathOperations();
print($mathOperationsObj->doOperation());
?>