Question

Hey does anyone know a reason why this is not working? its not calculating any of the additions and just entering 0 into the database. Any help would be great, thank you!.

$member_id = //users member id in database//
$track = //the track results being updated//
$engine = //the engine id from the members table in database//

$engine_points_system = array();
$engine_points_system["qualpos1"] = 30; 
$engine_points_system["qualpos2"] = 20;
$engine_points_system["qualpos3"] = 18;
$engine_points_system["qualpos4"] = 17;
$engine_points_system["qualpos5"] = 16;

$enginepoints = 0;
$qualifyingpoints = 0;

$results_query = mysql_query("SELECT pos_1, pos_2, pos_3, pos_4, pos_5 
from engine_qualifying_results WHERE track_id = '$track'")
or die ("Failed to update" . mysql_error());

$row = mysql_fetch_array($results_query);

$enginequalifying = array();
for ($i = 1; $i <= 5; $i++) {
     $enginequalifying["pos$i"] = $row['pos_$i'];
}

for($i = 1; $i <=5; $i++) {
    if($engine == $enginequalifying["pos$i"]){              
        $enginepoints += $engine_points_system["qualpos$i"];
        $qualifyingpoints += $engine_points_system["qualpos$i"];
    }
}

$results_query = mysql_query("INSERT INTO member_results (member_id, engine_points)              
VALUES ('$member_id', $enginepoints')")
or die ("Failed to update" . mysql_error());

Answer 1

$enginequalifying["pos$i"] = $row['pos_$i'];

In this line you have 'pos_$i'. This is the literal string 'pos_$i'. You should use "pos_$i" instead.

$enginequalifying["pos$i"] = $row["pos_$i"];

UPDATE:

In your code $enginequalifying is redundant, and not needed. You can just use $row in its place.

for($i = 1; $i <=5; $i++){
  if($engine == $row["pos_$i"]){              
    $enginepoints += $engine_points_system["qualpos$i"];
    $qualifyingpoints += $engine_points_system["qualpos$i"];
  }
}

Also, as @ax. points out, you have an extra ' (or a missing ') in your INSERT.

$results_query = mysql_query("INSERT INTO member_results (member_id, engine_points)
  VALUES ('$member_id', '$enginepoints')")
or die ("Failed to update" . mysql_error());