number of rows in a table

Answer 1

$query = "SELECT COUNT(*) FROM accounts";
$result = mysqli_query($mysqli,$query);
$rows = mysqli_fetch_row($result);
echo $rows[0];

or

$query = "SELECT COUNT(*) AS SUM FROM accounts";
$result = mysqli_query($mysqli,$query);
$rows = mysqli_fetch_assoc($result);
echo $rows['SUM'];