Call to undefined function mysqli_result::num_rows() - php

Question

I'm trying to count the number of rows in a result, and I keep getting the above returned error. I've checked the manual, and I'm using mysqli_result::num_rows() as I should be (I'm using object oriented style.) I've got three classes working here.
Class (Connection):
class utils_MysqlImprovedConnection {
protected $_connection;
public function __construct($host, $user, $pwd, $db)
{
$this->_connection = #new mysqli($host, $user, $pwd, $db);
if(mysqli_connect_errno ()) {
throw new RuntimeException('Cannot access database:' . mysqli_connect_error());
}
}
public function getResultSet($sql)
{
$results = new utils_MysqlImprovedResult($sql, $this->_connection);
return $results;
}
public function __destruct() {
$this->_connection;
}
}
Class (Handles Result):
class utils_MysqlImprovedResult implements Iterator, Countable {
protected $_key;
protected $_current;
protected $_valid;
protected $_result;
public function __construct($sql, $connection) {
if (!$this->_result = $connection->query($sql)){
throw new RuntimeException($connection->error . '. The actual query submitted was: '. $sql);
}
}
public function rewind()
{
if (!is_null($this->_key)){
$this->_result->data_seek(0);
}
$this->_current = $this->_result->fetch_assoc();
$this->_valid = is_null($this->_current) ? false : true;
}
public function valid()
{
return $this->_valid;
}
public function current()
{
return $this->_current;
}
public function key()
{
return $this->_key;
}
public function next()
{
$this->_current = $this->_result->fetch_assoc();
$this->_valid = is_null($this->_current) ? false : true;
$this->_key++;
}
public function count()
{
$this->_result->store_result();
$this->_result->num_rows();
}
}
Class function:
public function resetPassword($email, $pass){
//check if email exists, update authkey and password, send email
$sql = "SELECT * FROM table WHERE column = '$email'";
$results = $this->_db->getResultSet($sql);
if($results->count() == 1){
// Process
$this->_message = "Success!";
return $this->_message;
} else {
// Not unique
$this->_error = "Try again";
return $this->_error;
}
}
The test page I'm using to call all this is (include statement is just __autoload() function that is working fine):
$columnvar = 'emailaddress#test.com';
$pass = 'blah';
require_once 'inc.init.php';
$user = new utils_User();
try{
$string = $user->resetPassword($email, $pass);
echo $string;
}
catch(Exception $e) {
echo $e;
}

Answer 1

From the manual, it seems that mysqli_result::num_rows isn't a function, but rather a variable containing the number of rows.
It can be used like this:
$num_rows = $mysqli_result->num_rows;
The function equivalent is mysqli_num_rows($result), where you pass in the mysqli_result object, but that's if you're using the procedural style rather than object oriented style.
In your code, you should change your count() function in the utils_MysqlImprovedResult class to be like this (I'm assuming that's the function where you're getting the error message),
public function count()
{
// Any other processing you want
// ...
return $this->_result->num_rows;
}
or alternatively if you want to mix OO and procedural styles (probably a bad idea),
public function count()
{
// Any other processing you want
// ...
return mysqli_num_rows($this->_result);
}