Tác dụng của hàm array_column()
The array_column() function return the values from a single column in the input array.
The following table summarizes the technical details of this function.
| Return Value: | Returns an array of values representing a single column from the input array. |
|---|---|
| Changelog: | Since PHP 7.0.0, an array of objects can also be used. |
| Version: | PHP 5.5.0+ |
Syntax
The basic syntax of the array_column() function is given with:
The following example shows the array_column() function in action.
Example
Run this code » "1",
"name" => "Titanic",
"genre" => "Drama",
),
array(
"id" => "2",
"name" => "Justice League",
"genre" => "Action",
),
array(
"id" => "3",
"name" => "Joker",
"genre" => "Thriller",
)
);
// Getting the column of names
$names = array_column($movies, "name");
print_r($names);
?>Parameters
The array_column() function accepts the following parameters.
| Parameter | Description |
|---|---|
| array | Required. Specifies a multi-dimensional array or an array of objects to work on. |
| column_key |
Required. Specifies the index or key name of the column you want to retrieve. This parameter can also be
NULL to return complete arrays or objects (this is useful together with the index_key parameter to reindex the array). |
| index_key | Optional. Specifies the column to use as the index/keys for the returned array. |
More Examples
Here're some more examples showing how array_column() function actually works:
The following example demonstrates how to retrieve the "name" column values from the movies array indexed by the "id" column values. You can choose any column for indexing purpose.
Example
Run this code » "1",
"name" => "Titanic",
"genre" => "Drama",
),
array(
"id" => "2",
"name" => "Justice League",
"genre" => "Action",
),
array(
"id" => "3",
"name" => "Joker",
"genre" => "Thriller",
)
);
// Getting the column of names
$names = array_column($movies, "name", "id");
print_r($names);
?>The following example get the column of names from the public "name" property of an object.
Example
Run this code »name = $name;
}
}
// Creating the array of objects
$persons = [
new Person("Peter"),
new Person("Alice"),
new Person("Clark"),
];
// Getting the column of names
$names = array_column($persons, "name");
print_r($names);
?>