do something on first array in for each code example

Example 1: if first php

$x = 1;
$length = count($data); 

foreach($data as $value){
        echo"
            <button class='btn";
                if($x === 1){
                    echo " first";
                }
                else if($x === $length){
                    echo " last"; 
                }
                $x++;
        echo"
           '>$value->services_name</button>
        ";
    }

Example 2: @foreach 1 numper

$i = 0;
foreach ( $signatures as $signature ) {
    if($i==10){
        break;
    }
    echo 'Signature ID: ' . $signature . $i;
    $i++;
}