php pluck的典型用例有哪些

1. 从数组中提取指定键的值组成新的数组：

$data = [     ['id' => 1, 'name' => 'Alice'],     ['id' => 2, 'name' => 'Bob'],     ['id' => 3, 'name' => 'Charlie'] ];  $names = array_column($data, 'name'); print_r($names); 

2. 从对象数组中提取指定属性的值组成新的数组：

class User {     public $id;     public $name;      public function __construct($id, $name) {         $this->id = $id;         $this->name = $name;     } }  $users = [     new User(1, 'Alice'),     new User(2, 'Bob'),     new User(3, 'Charlie') ];  $names = array_column($users, 'name'); print_r($names); 

3. 从关联数组中提取指定键的值组成新的数组：

$data = [     'id' => 1,     'name' => 'Alice',     'age' => 25 ];  $values = array_values($data); print_r($values);