Question

This one is confusing me. I have two different mySQL tables I need to pull information from and I am creating a html dropdown table and trying to populate the value from a variable. It works the first time through the loop, but not after that. I get a warning (when viewing the html):

b>Warning</b>:  array_combine() expects parameter 1 to be array, integer given in <b>/MY URL</b> on line <b>56</b><br />
<br />

Easier to just show the code, so here it is:

$UserID = "118";
$UndefinedEvents = array();
$EventDates = array();
$UserTimelines = array();


  $query = "SELECT * FROM  events  WHERE UserID='$UserID' AND ParentEventID IS NULL";
  $result = mysql_query($query);

  $query2 = "SELECT * FROM  timelines  WHERE UserID='$UserID'";
  $result2 = mysql_query($query2);

  //Getting the Timeline names and their IDs
  while($row = mysql_fetch_array($result2))
    {
    $UserTimelines[] = $row['TimeLineName'];
    $TimelineID[] = $row['TimeLineID'];
    }

  //Getting and events that have a NULL value   
  while($row = mysql_fetch_array($result))
  {
    echo $row['UserID'] . " ".$row['EventName']. " " . $row['ParentEventID'];
    $UndefinedEvents[] = $row['EventName'];
    $EventDates[] = $row['StartDate'];
  }

  //Iterating through events with NULL value and telling user which events are NULL
  foreach (array_combine($UndefinedEvents, $EventDates) as $event=>$dates){
    echo "This Event does not have a Timeline associated with it: " .$event . " on ".$dates. '<br>';
  echo "Choose a Timeline:<br>";
  ?>

  <select>

  //THIS IS LINE 56:  Iterating through the timelines and creating a dropdown for the user to choose a timeline.
  <?php foreach (array_combine($TimelineID, $UserTimelines) as $TimelineID=>$timeline){ 
        echo "<option value=".$TimelineID."> ".$timeline. "</option>";

  }
  echo " </select><br><br>";
  }
  ?>

  <?php
    mysql_close($con);  
?>

Like I said, it works the first loop, and is properly putting the values in, but each loop after just creates the above warning.

Answer 1

In your second foreach, you are overwriting your $TimelineID variable:

foreach (array_combine($TimelineID, $UserTimelines) as $TimelineID=>$timeline){

Just use something else like:

foreach (array_combine($TimelineID, $UserTimelines) as $temp_TimelineID=>$timeline){