loops - PHP - Looping $_POST in PHP Query -

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first im student. im trying make looping in $_post php statements this

if ($_post) { //get value of latitude, longitude, radius site.php calculate in query above     include('config/dbconnect.php'); //database connection     $lat = array();     $lon = array();     $rad = array();     $stmt = array();     $sql = array();      $lat1 = $_post['lat1']; //get value of latitude 1     $lon1 = $_post['lon1']; //get value of longitude 1     $rad1 = $_post['rad1']; //get value of radius 1     $endrow = $_post['endrow'];      ($i = 2; $i <= $endrow; $i++) {         $lat[$i] = $_post['lat'.$i]; //get value of latitude n         $lon[$i] = $_post['lon'.$i]; //get value of longitude n         $rad[$i] = $_post['rad'.$i]; //get value of radius n     }      //haversine formula , view match site ci , d2g_trx ci     $sql = "select site.*,d2g_trx.*,         ( 6371 * acos( cos( radians($lat1) )                        * cos( radians( site.latitude ) )                        * cos( radians( site.longitude ) - radians($lon1) )                      +   sin( radians($lat1) )                        * sin( radians( site.latitude ) ) ) ) distance         site         inner join d2g_trx on site.ci = d2g_trx.ci         having distance <=$rad1         order distance         limit 0 , 50";       $stmt = $dbh->query($sql)->fetchall(); // input 1      ($j = 2; $j <= $endrow; $j++) {         //haversine formula , view match site ci , d2g_trx ci         $sql[$j] = "select site.*,d2g_trx.*,             ( 6371 * acos( cos( radians($lat[$j]) )                            * cos( radians( site.latitude ) )                            * cos( radians( site.longitude ) - radians($lon[$j]) )                          +   sin( radians($lat[$j]) )                            * sin( radians( site.latitude ) ) ) ) distance             site             inner join d2g_trx on site.ci = d2g_trx.ci             having distance <=$rad[$j]             order distance             limit 0 , 50";          $stmt[$j] = $dbh->query($sql[$j])->fetchall(); //input n     } }

i got error

fatal error: call member function fetchall() on non-object in f:\xampp\htdocs\kp\getsite.php on line 28

anyway, line 28 one

$stmt[$j]= $dbh->query($sql[$j])->fetchall(); //input n

sorry, english bad :(

any idea how fix sir ?

thanks before

just because can this:

$dbh->query($sql[$j])->fetchall();

doesn't mean should. @ least testing purposes should @ return values (i assume use pdo):

$result = $db->query($sql[$j]); if($result === false) {     print_r($db->errorinfo());     exit; } $stmt[$j] = $result->fetch();

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