PHP, SQL limit query by php variable

Question

PHP code defining variable sqlshowvalue

$sqlshowvalue = 5;
if(isset($_POST[\'showmore\'])) {
     $sqlshowvalue += 5;
}

So I connect to my

Answer 1

Remove '' use only $sqlshowvalue:-

$result = mysqli_query($conn,"SELECT * FROM comments 
ORDER BY id DESC limit $sqlshowvalue");

for integer value no need of ''