Introduce some features of PHP7
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1.Usage of use
<?php
// PHP 7 之前版本用法
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;
// PHP 7+ 用法
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};
?>
2. The serial number function unserialize has a new filtering function
// 转换对象为 __PHP_Incomplete_Class 对象 $data = unserialize($foo, ["allowed_classes" => false]); // 转换对象为 __PHP_Incomplete_Class 对象，除了 MyClass 和 MyClass2 $data = unserialize($foo, ["allowed_classes" => ["MyClass", "MyClass2"]); // 默认接受所有类 $data = unserialize($foo, ["allowed_classes" => true]);
3. Define a constant array through define
<?php
define('ANIMALS', [
'dog',
'cat',
'bird'
]);
echo ANIMALS[1]; // 输出 "cat"
define("GREETING","Hello you! How are you today?",TRUE);
echo constant("greeting"); //返回常量的值
?>
4. Ternary operator null merge
<?php // 如果 $_GET['user'] 不存在返回 'nobody'，否则返回 $_GET['user'] 的值 $username = $_GET['user'] ?? 'nobody'; // 类似的三元运算符 $username = isset($_GET['user']) ? $_GET['user'] : 'nobody'; ?>
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