if first php

1$x = 1;
2$length = count($data); 
3
4foreach($data as $value){
5        echo"
6            <button class='btn";
7                if($x === 1){
8                    echo " first";
9                }
10                else if($x === $length){
11                    echo " last"; 
12                }
13                $x++;
14        echo"
15           '>$value->services_name</button>
16        ";
17    }