如何在类的方法中引用include进来的文件中的变量？

Question

include 'db_link.php';

class Search
{

private $S_id;
private $D_id;
private $range;

public function setS_id($S_id){
    $this->S_id = $S_id;
}

public function get_Sid(){
    return $this->S_id;
}

public function setD_id($D_id){
    $this->D_id = $D_id;
}

public function getD_id(){
    return $this->D_id;
}

public function checkPerson($S_name){
    
}

在方法checkPerson（）中如何访问'db_link.php'的变量？

Answer 1

我都是这样的： class A{ public $db; public function __construct(){ include 'db_link.php'; $this->db = $arg_from_db_link; } }

Answer 2

a.php $a = 111; return $a; b.php $c = include 'a.php'; echo $c;