sql - count number of rows in table using php

Question

I just want to count the number of rows in a table that already created in a database using php. I used mysqli(). I need the number of rows in the table as the output.

Answer 1

 <?php
  $mysqli = new mysqli("hostname", "dbusername", "dbpassword", "dbname");

   /* check connection */
   if (mysqli_connect_errno()) {
    printf("Connect failed: %s
", mysqli_connect_error());
     exit();
   }

  if ($result = $mysqli->query("SELECT count(*) cc FROM tablename")) {

     /* fetch the first row as result */
     $row = $result->fetch_assoc();

    printf("Result set has %d rows.
", $row['cc']);

   /* close result set */
    $result->close();
 }

 /* close connection */
 $mysqli->close();
?>

In fact it's a common question you can find the answer anywhere.

Like, http://php.net/manual/en/mysqli-result.num-rows.php

You could separate this problem in to two

1. I wanna know how to connect to mysql.
2. I wanna know how to write that sql instruction.