php mysql return wrong boolean result - php

Question

I have the following query :
'SELECT Active FROM tbUsers WHERE Id=55'
The Id is unique and I need just to know the status of the user if he's active yes or no. The Column Active is set as boolean in Mysql
When I tried to return the result like the following (using another php function) :
$result = $this->selectRow($db,"tbClass","Active","Id='$Id'");
if($result) { return "ok" ; } else { return "nok" ;)
it returns 'ok' on both cases.
Any idea what's wrong with it ?
Here is the other function :
public function selectRow($db,$tableName,$field,$where) {
if($where == "") {
$query = "SELECT $field FROM $tableName";
}
else
{ $query = "SELECT $field FROM $tableName WHERE $where"; }
$result=$db->Qry($query);
if ($result) {
$no_of_rows = $db->TotRows($result);
if($no_of_rows == 1) {
return $result;
}
if($no_of_rows == 0) {
return '';
}
if($no_of_rows < 0) {
die('Invalid query: ' . $sender ."(".$query ."): ".mysql_errno().": ". mysql_error());
return '';
}
}
else {
die('Invalid query: ' . $sender .": " .$query.": ". mysql_errno().": ". mysql_error());
return '';
}
}
Qry Function is the following :
function Qry($sql) {
if($result = mysqli_query($this->con,$sql) ) {
return $result;
}
else
{
$err = "Error: ".$sql. " :: ". mysqli_error;
die("$err");
}
}

Answer 1

I think you need to change this condition .
$result=$db->Qry($query);
always return you query object
Just remove this condition and
You need to count number of affected row
<?php
public function selectRow($db, $tableName, $field, $where) {
if ($where == "") {
$query = "SELECT $field FROM $tableName";
} else {
$query = "SELECT $field FROM $tableName WHERE $where";
}
$result = $db->Qry($query);
$no_of_rows = $db->TotRows($result);
if ($no_of_rows == 1) {
return $result;
}
if ($no_of_rows == 0) {
return FALSE;
}
if ($no_of_rows < 0) {
die('Invalid query: ' . $sender . "(" . $query . "): " . mysql_errno() . ": " . mysql_error());
return FALSE;
}
}

Answer 2

Alright, so $result is a mysqli_result object.
You might want to fetch the first row of that result and return the desired column.
Replace
return $result;
with
return $result->fetch_assoc()[$field];