mysqli_num_rows() expects parameter 1 to be mysqli_result, object

Question

This is my first experience with mysqli. It seems to be looking for the name of a result set in between the parentheses in mysqli_num_rows(). Yet when I tried $stmt, $conn,

Answer 1

You're combining procedural and object oriented approaches, when you only want object oriented. Change

$num=mysqli_num_rows($WHAT);

to

$num = $stmt->num_rows();

Answer 2

The reason for this error is that you may be passing the $stmt object to mysqli_num_rows().

Moreover, what I see is that you're mixing up two different approaches in php for using mysql databases - the Object-Oriented Approach and the Procedural Approach. You have to chose one of them and then proceed something like this -

Procedural Approach (Using mysqli extension)

$con = mysqli_connect("localhost", "user", "pass", "test") or die("Connection Error: " . mysqli_error($conn));
$query = "SELECT id, name, status, type FROM organization"; 
$result = mysqli_query($con, $query) or die(mysqli_error($con));
$count = mysqli_num_rows($result);

// $count now stores the number of rows returned from that query

Object-Oriented Approach (Using mysqli extension)

<?php
$host = "localhost";
$username = "user";
$password = "pass";
$dbname = "test";

// Create connection
$conn = new mysqli($host, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 

$sql = "SELECT id, name, status, type FROM organization";
$result = $conn->query($sql);
$count = $result->num_rows;
// $count now stores the number of rows returned
$conn->close();
?>

You can read more about it here - https://www.w3schools.com/php/php_mysql_select.asp

Answer 3

mysqli_num_rows takes the query result as a parameter http://us.php.net/manual/en/mysqli-result.num-rows.php

You could also use it in an OOP style as $result->num_rows;