As we already know, a struct is a complex data type where we define multiple properties as a group so that we can use it as a single data type. We can write a struct using a PHP array and class. Here is an example of a struct using a PHP array:

$player = [ 
    "name" => "Ronaldo", 
    "country" => "Portugal", 
    "age" => 31, 
    "currentTeam" => "Real Madrid" 
]; 

It is simply an associative array with keys as string. A complex struct can be constructed using single or more constructs as its properties. For example using the player struct, we can use a team struct:

$ronaldo = [ 
    "name" => "Ronaldo", 
    "country" => "Portugal", 
    "age" => 31, 
    "currentTeam" => "Real Madrid" 
]; 

$messi = [ 
    "name" => "Messi", 
    "country" => "Argentina", 
    "age" => 27, 
    "currentTeam" => "Barcelona" 
]; 

$team = [ 
    "player1" => $ronaldo, 
    "player2" => $messi 
]; 

The same thing we can achieve using PHP Class. The example will look like:  
Class Player { 

    public $name; 
    public $country; 
    public $age; 
    public $currentTeam; 

} 

$ronaldo = new Player; 
$ronaldo->name = "Ronaldo"; 
$ronaldo->country = "Portugal"; 
$ronaldo->age = 31; 
$ronaldo->currentTeam = "Real Madrid"; 

Since we have seen both ways of defining a struct, we have to choose either one of them to implement a struct. While creating an object might look more convenient, it is slower compared to array implementation. Where an array has an added advantage of speed, it also has a disadvantage as it takes more memory space compared to an object. Now we have to make the decision based on our preference.