警报消息无法使用 php

Question

I was trying to code where whenever I hit the submit button it will show an alert message when there's no data fetch. Can anyone help me?

if(isset($_POST['submitEstatus'])) {
 if($_POST['empValue'] == $valEmp AND $_POST['ageValue'] == $valAge AND $_POST['genValue'] == $valGen){ 
    $query = "SELECT * FROM users $valEmp $valAge $valGen"; 
    $result = mysql_query($query);
    if ($result = 0) {
        $message = "No Data";
        echo "<script type='text/javascript'>alert('$message');</script>";
    } else {
        while($row = mysql_fetch_array($result)){
            $lat = $row['lat'];
            $lon = $row['lon'];
            $fname = $row['fname'];
            $address = $row['address'];             
            echo("addMarker($lat, $lon, '<b>$fname</b><br />$address');\n");
            $ageSelected = $valAge;
            $empSelected = $valEmp;
            $genSelected = $valGen;
        }     
    }   
}

I have this error:

mysql_fetch_array() expects parameter 1 to be resource, integer given in on line

Answer 1

On your if statement you are not comparing the value:

if ($result = 0) { ....

You are setting 0 to $result .

You should use

if ($result == 0) { ...