array_column - Return the values from a single column in the input array
Вернуться к: Функции для работы с массивами
array_column
(PHP 5 >= 5.5.0, PHP 7)
array_column — Return the values from a single column in the input array
Описание
array_column() returns the values from a single column of
the input, identified by the
column_key. Optionally, an
index_key may be provided to index the values in the
returned array by the values from the index_key
column of the input array.
Список параметров
-
input -
A multi-dimensional array or an array of objects from which to pull a column of values from. If an array of objects is provided, then public properties can be directly pulled. In order for protected or private properties to be pulled, the class must implement both the __get() and __isset() magic methods.
-
column_key -
The column of values to return. This value may be an integer key of the column you wish to retrieve, or it may be a string key name for an associative array or property name. It may also be
NULLto return complete arrays or objects (this is useful together withindex_keyto reindex the array). -
index_key -
The column to use as the index/keys for the returned array. This value may be the integer key of the column, or it may be the string key name.
Возвращаемые значения
Returns an array of values representing a single column from the input array.
Список изменений
| Версия | Описание |
|---|---|
| 7.0.0 |
Added the ability for the input parameter to be
an array of objects.
|
Примеры
Пример #1 Get the column of first names from a recordset
<?php
// Array representing a possible record set returned from a database
$records = array(
array(
'id' => 2135,
'first_name' => 'John',
'last_name' => 'Doe',
),
array(
'id' => 3245,
'first_name' => 'Sally',
'last_name' => 'Smith',
),
array(
'id' => 5342,
'first_name' => 'Jane',
'last_name' => 'Jones',
),
array(
'id' => 5623,
'first_name' => 'Peter',
'last_name' => 'Doe',
)
);
$first_names = array_column($records, 'first_name');
print_r($first_names);
?>
Результат выполнения данного примера:
Array
(
[0] => John
[1] => Sally
[2] => Jane
[3] => Peter
)
Пример #2 Get the column of last names from a recordset, indexed by the "id" column
<?php
// Using the $records array from Example #1
$last_names = array_column($records, 'last_name', 'id');
print_r($last_names);
?>
Результат выполнения данного примера:
Array
(
[2135] => Doe
[3245] => Smith
[5342] => Jones
[5623] => Doe
)
Пример #3 Get the column of usernames from the public "username" property of an object
<?php
class User
{
public $username;
public function __construct(string $username)
{
$this->username = $username;
}
}
$users = [
new User('user 1'),
new User('user 2'),
new User('user 3'),
];
print_r(array_column($users, 'username'));
?>
Результат выполнения данного примера:
Array
(
[0] => user 1
[1] => user 2
[2] => user 3
)
Пример #4 Get the column of names from the private "name" property of an object using the magic __get() method.
<?php
class Person
{
private $name;
public function __construct(string $name)
{
$this->name = $name;
}
public function __get($prop)
{
return $this->$prop;
}
public function __isset($prop) : bool
{
return isset($this->$prop);
}
}
$people = [
new Person('Fred'),
new Person('Jane'),
new Person('John'),
];
print_r(array_column($people, 'name'));
?>
Результат выполнения данного примера:
Array
(
[0] => Fred
[1] => Jane
[2] => John
)
Вернуться к: Функции для работы с массивами