Question

I am currently attempting to extract data from a mysql DB and then place it into a multidimensional array, using the device name as a key.

The issue I’m having is that every time I iterate through the results the code im using kills the last item and replaces it.

Here is the code;

##sql connection##
$result = mysql_query(SELECT Device.DeviceID, Device.DeviceName, History.HistoryRec, History.HistoryDetectedDate from Device JOIN History ON Device.DeviceID=History.DeviceID WHERE History.Active_LastRound = 1 AND History.DetectedDate <= $hrs);
if (!$result){
die('invaild query:' . mysql_error());

while($row = mysql_fetch_array($result))
{
$last24hoursarray[$row['DeviceName']] = array($row['HistoryRec']);
}

So the issue i have is that my results set has multiple records with the same device name, and i cant work out how to put them into an array so that they do not overwrite the last item

for example i want

switch1 => issue1
switch1 => issue2
switch1 => issue3
switch2 => issue1
etc

but what i get is;

switch1 => issue3
switch2 => issue1

Thanks in advance. This is the first bit of PHP i have written, so please be gentle 😀

Answer 1

PHP Array keys are unique, so you would not be able to store multiple values under the same key, try the following:

while($row = mysql_fetch_array($result)) {
        $last24hoursarray[$row['DeviceName']][] = $row['HistoryRec'];
}