Is it possible to call the function in elseif condition?

I have created a simple code to call the function in the else if condition but I want to know the better solution for this or How can we achieve this in a different manner if we have some data condition in any function which depends on the else if condition. Thanks

<?php
$a = 10;
$b = 20;

function getdata($a, $b)
{
    
    if($a == $b)
    {
        return true;
    }
    else{
        return false;
    }
}

if ($a > $b) {
    echo "if condition"; 
} elseif (getdata($a, $b)) {
    echo "a is equal to b";
} else {
    echo "a is smaller than b";
}
?>