Question

我有以下的PHP代码

<?php

class Test {

    public static function bar(array $ids) {
        return array_map(function($id) {
            return static::foo($id);
        }, $ids);
    }

    public static function foo($id) {
        return "halo {$id}";
    }
}

class Test1 extends Test {

    public static function foo($id) {
        return "hi {$id}";
    }
}

$className = Test1::class; 
//Let's say line above is input from user or some other code.
$ids = [1, 2, 3, 4, 5];
print_r(call_user_func([$className, 'bar'], $ids));

我预计上面的代码会返回

Array
(
    [0] => hi 1
    [1] => hi 2
    [2] => hi 3
    [3] => hi 4
    [4] => hi 5
)

但奇怪的是，它返回

Array
(
    [0] => halo 1
    [1] => halo 2
    [2] => halo 3
    [3] => halo 4
    [4] => halo 5
)

为什么？

我的PHP版本低于

PHP 5.5.9-1ubuntu4.9 (cli) (built: Apr 17 2015 11:44:57) 
Copyright (c) 1997-2014 The PHP Group
Zend Engine v2.5.0, Copyright (c) 1998-2014 Zend Technologies
    with Zend OPcache v7.0.3, Copyright (c) 1999-2014, by Zend Technologies

但奇怪的是，HHVM回归了我的预期。

HipHop VM 3.6.5 (rel)
Compiler: tags/HHVM-3.6.5-0-g20a30678cd67fad96602ffd93e69780d001ce57f
Repo schema: 53a4026d3732c3584cffef19fa47fea655be3c4f

Answer 1

这是5.5.14之前的错误。有关详细信息，请参阅the changelog。可能这样：

CREATE TABLE salary {
    ID int,
    salary float,
    primary key (ID),
}
CREATE TABLE employee { 
    ID int,
    salary_ID int,
    primary key (ID),
    foreign key(salary_ID) references salary (ID)
            ON DELETE CASCADE
            ON UPDATE CASCADE
}

编辑：链接以确认不同版本中的错误：https://3v4l.org/BiYk2

为什么后期静态绑定在匿名函数内不起作用？

1 个答案: