number of rows in a table

Answer 1

conncet.php

<?php
class database
{
  public $host = "localhost";
  public $user = "root";
  public $pass = "";
  public $db   = "db";
  public $link;

  public function __construct()
  {
     $this->connect();
  }

  private function connect()
  {
     $this->link = new mysqli($this->host, $this->user, $this->pass, $this->db);
     return $this->link;
  }

 public function select($query)
 {
    $result = $this->link->query($query) or die($this->link->error.__LINE__);
    if($result->num_rows > 0)
    {
      return $result;
    } 
    else 
    {
        return false;
    }
}
?>

Now action.php where query can be done as follows :

<?php  include 'database.php'; ?>
 $db = new database();
 $query = "SELECT COUNT(*) FROM accounts";
 $row = $db->select($query)->num_rows;
 echo $row;
?>

Full conncetion.php : link

Answer 2

$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'];

Answer 3

What you ask for is pretty standard interaction with the Mysqli Result Object. One thing is the number of rows returned, and the other thing is to get the actual count value:

$query  = "SELECT COUNT(*) FROM accounts";
$result = $mysqli->query($query);

echo 'Number of rows: ', $result->num_rows, "\n"; // 1 in your case

list($count) = $result->fetch_row();

echo 'COUNT(*): ', $count, "\n"; // the value from the database