如果执行查询，则显示查询结果

What I am trying to do is get the values of the $r variable (returns some vehicle id values) to display on the page. However it returns the following error.

Recoverable fatal error: Object of class mysqli_result could not be converted to string in C:\xampp\htdocs\SAMADHI\system\moduleeservation\controllereservationcontroller.php on line 166

The problem is on the echo $r statement. I tried echo '$r' but then it shows nothing even though it displays the the message 'vehicle available'.

if ($nor > 0) {
    $r = $objs->searchVehicle($vhandover, $vreturn, $seatcap);
    if ($r) {
        $msg = "Vehicle available";               
        $status = 1;
        echo $r;       
    } else {
        $msg = "Something is not right!";
        $status = 0;
    }
}

What am I doing wrong here and how can I correct it?

Thanks in advance :)

Let me assume, your vehicle table have following column - id, name, type. When your query executes, $r holds an associative array with search result-

$r = [ ['id'=>1, 'name'=>"toyota", 'type'=> "regular"], ....]

This is not any String. So if you want to echo any of the column value you need to mention it like -

echo $r['name'];

But if your query returns multiple results then, you need to put the echo inside a foreach loop.

foreach($r as $row) {
    echo $row['name'];
}

UPDATE
If the above code doesn't work for you then try the following-

while($row = $r->fetch_assoc()) {
    echo $row['id'];
}

UPDATE: 2 You can use fetch_array($r) -

while ($row = fetch_array($r)) {
    echo $row['name'];
}

Hope that clears your concept!