PHP.是否可以将array_column与对象数组一起使用 [英] PHP. Is it possible to use array_column with an array of objects

问题描述

是否可以传递array_column对象数组?
我已经实现了ArrayAccess接口，但是没有效果.
我应该再实施一个吗?

Is it possible to pass in array_column an array of objects?
I have implemented ArrayAccess interface, but it has no effect.
Should I implement another one?

class Foo implements ArrayAccess {

    public $Id, $Title;

    public function offsetExists($offset)
    {
        return isset($this->{$offset});
    }    

    public function offsetGet($offset)
    {
        return $this->{$offset};
    }

    public function offsetSet($offset, $value)
    {
        $this->{$offset} = $value;
    }

    public function offsetUnset($offset)
    {
        unset($this->{$offset});
    }
}

$object = new \Foo();
$object->Id = 1;
$object->Title = 'Test';

$records = array(
    $object, 
    array(
        'Id' => 2,
        'Title' => 'John'
    )
);

var_dump(array_column($records, 'Title')); // array (size=1) 0 => string 'John' (length=4)

推荐答案

PHP 5

array_column不适用于对象数组.使用array_map代替:

array_column doesn't work with an array of objects. Use array_map instead:

$titles = array_map(function($e) {
    return is_object($e) ? $e->Title : $e['Title'];
}, $records);

PHP 7

array_column()

该函数现在支持对象数组以及 二维数组.仅考虑公共财产，并且 将__get()用于动态属性的对象还必须 实施__isset().

The function now supports an array of objects as well as two-dimensional arrays. Only public properties are considered, and objects that make use of __get() for dynamic properties must also implement __isset().

请参见 https://github.com/php /php-src/blob/PHP-7.0.0/UPGRADING#L629 - 感谢贝尔的提示！

See https://github.com/php/php-src/blob/PHP-7.0.0/UPGRADING#L629 - Thanks to Bell for the hint!

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