mysqli_result::$num_rows

mysqli_num_rows

(PHP 5)

mysqli_result::$num_rows -- mysqli_num_rows — Gets the number of rows in a result

Description

Object oriented style

int $mysqli_result->num_rows;

Procedural style

int mysqli_num_rows ( mysqli_result $result )

Returns the number of rows in the result set.

The behaviour of mysqli_num_rows() depends on whether buffered or unbuffered result sets are being used. For unbuffered result sets, mysqli_num_rows() will not return the correct number of rows until all the rows in the result have been retrieved.

Parameters

result: Procedural style only: A result set identifier returned by mysqli_query(), mysqli_store_result() or mysqli_use_result().

Return Values

Returns number of rows in the result set.

Note:
If the number of rows is greater than MAXINT, the number will be returned as a string.

Examples

Example #1 Object oriented style


<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");

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

if ($result = $mysqli->query("SELECT Code, Name FROM Country ORDER BY Name")) {

    /* determine number of rows result set */
    $row_cnt = $result->num_rows;

    printf("Result set has %d rows.\n", $row_cnt);

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

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

Example #2 Procedural style


<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");

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

if ($result = mysqli_query($link, "SELECT Code, Name FROM Country ORDER BY Name")) {

    /* determine number of rows result set */
    $row_cnt = mysqli_num_rows($result);

    printf("Result set has %d rows.\n", $row_cnt);

    /* close result set */
    mysqli_free_result($result);
}

/* close connection */
mysqli_close($link);
?>

The above examples will output:

Result set has 239 rows.


<?php



    class mysqlisimple extends mysqli {

        public function __construct($hostname, $username, $password, $database) {

            $this->connection = @parent::__construct($hostname, $username, $password, $database);

            if($this->connection->connect_error) {

                die($this->connection->connect_error); 

            }

        }

        public function DBResult($query) {

            $this->PrepareQuery = $query;

            if ($this->Result = $this->query($this->PrepareQuery)) {

                while ($this->row = $this->Result->fetch_row()) {

                    $this->output = $this->row[0];

                }

            }

            return $this->output;

        }

    }

    

?>



This is a simple class to extend MySQLi and includes a function to fetch a single result. Was just playing, thought it may help some.

borisigna 07-Aug-2011 08:19


If you have problems making work this num_rows, you have to declare ->store_result() first.



<?php

$mysqli = new mysqli("localhost","root", "", "tables");



$query = $mysqli->prepare("SELECT * FROM table1");

$query->execute();

$query->store_result();



$rows = $query->num_rows;



echo $rows;



// Return 4 for example

?>

randomsort at gmail dot com 27-Jun-2011 01:39


This may be a bug or a feature, but I do see peculiar behaviour with regards to this feature on  php version  5.2.6-1+lenny10.





The value in mysqli-result->num_rows is not the total number of rows, but rather the number of rows you have iterated over so far.





<?php


$sql = "valid select statement that yields results";


if($result = mysqli-connection->query($sql, MYSQLI_USE_RESULT))


{


          echo $result->num_rows; //zero


          while($row = $result->fetch_row())


        {


          echo $result->num_rows; //incrementing by one each time


        }


          echo $result->num_rows; // Finally the total count


}


?>





This has had me confused more than a few times,


I hope I can save you some of that trouble.





Regards,


Johan Abildskov

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