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PHP 7新特性介绍详解介绍

Jun 08, 2016 pm 05:20 PM
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PHP 7新特性有那些?PHP 7新特性主要是在性能上提升了不少了,我们可以不使用php加速插件只要使用PHP 7即可达到加速性能了,真是这样吗?我们来看看PHP 7新特性有哪些。

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PHP 7在性能方面的突破成为近来最热门的话题之一,目前官方PHP 7.0.0 Beta 2已经发布
新特性
性能提升:PHP 7要比PHP 5.6快两倍
全面一致的64位支持
移除了一些老的不在支持的SAPI(服务器端应用编程端口)和扩展
新增了空接合操作符(??)【wiki】

$username = $_GET['user'] ?? 'nobody';
// equivalent to: $username = isset($_GET['user']) ? $_GET['user'] : 'nobody';

新增加了结合比较运算符()【wiki】

$a = 1;
$b = 2;
 
switch ($a  $b)
{
    case 1:
        echo "a > b";
        break;
    case 0:
        echo "a == b";
        break;
    case -1:
        echo "a         break;
}

新增加了函数的返回类型声明【wiki】

function foo(): array {
    return [];
}

新增加了标量类型声明【wiki】

//标量声明的主要作用是自动实现参数的强制类型转换
//变量类型声明(int, float, string , bool)
function add(int $a, int $b): int {
    return $a + $b;
}

新增加匿名类【wiki】

class Foo {}
$child = new class extends Foo {};
var_dump($child instanceof Foo); // true

可捕获致命错误,较早版本只能通过register_shutdown_function()事后处理。(wiki)

Benchmark
测试代码:
$count = $argv[1];
 
$a = array();
for ($i = 0; $i     $a[$i] = $i;
}
 
foreach ($a as $i) {
    array_key_exists($i, $a);
}

测试效果如下

可见PHP 7相对于PHP 5.4有数倍以上的速度提升。


社区中的Benchmark结果:


以WordPress开源博客首页为测试场景的测试结果:

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