php - How can we access a one class object in another class?

Solution:

You need to refer to the global$db variable first and then use it in a statement. You also have a minor syntax error in your constructor. You forgot to use the$this keyword when referring your your$db property.

function __construct(){
    global $db
    $this->db = $db;
}
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It also is a better practice not to use global variables and instead pass any variables that you need as parameters to your method call. In this case it is your constructor:

function __construct($db){
    $this->db = $db;
}

$list_of_record = ListofRecord($db);
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