PHP数组长度

Question

So this may be a bit long winded to explain, but I'll try to make it concise.

I have a db query that pulls in 3 different Tag IDs, 2 of them are associated to 4 Hub IDs, while 1 is associated with only 3.

I return all tags, and sort the results by ID (so all 4 results for tag 1 are grouped, all 4 of 2, and all 3 of 3) Like so:

Array
    (
        [0] => 40BD32751DF1
        [1] => 40BD32751DF1
        [2] => 40BD32751DF1
        [3] => 40BD32751DF1
        [4] => 10CEA9FD173A
        [5] => 10CEA9FD173A
        [6] => 10CEA9FD173A
        [7] => 10CEA9FD173A
        [8] => 10CEA9FCFE26
        [9] => 10CEA9FCFE26
        [10] => 10CEA9FCFE26
    )

Then I do a while loop and loop it for each Tag ID (3x). Inside that, I use array_keys on an array_column search to find the array indexes of each Tag ID, count how many results I have (4, 4, 3) I then take that row's data using the array key, and loop number to push that row of data into an array for later sorting:

while($currentTag = pg_fetch_assoc($tagList)) {
    $tkeys = array_keys(array_column($tagDataArray, 'devmac'), $currentTag['devmac']);
    $tempArray = array();
    for($k=0; $k < count($tkeys); $k++){
        array_push($tempArray, $tagDataArray[$tkeys[$k]]);
    }

//Then I sort that temporary array so one of the values in the row is the highest:

    foreach($tempArray as $sigkey => $sigrow) { 
        $sigsort[$sigkey] = $sigrow['devrssi']; 
    }
    array_multisort($sigsort, SORT_DESC, $tempArray);
    updateArticles($tempArray[0]);
}

Now the problem comes from that temporary array. I have 4 results for the first ID, 4 for the second, then 3 for the third, yet for the third ID, somehow I still get 4 items in the array even though I reinitialize it with each while loop pass (each ID). The fourth result from the second ID, ends up as the fourth result for the third ID.

How is this possible? I've been trying to figure this out for hours and I'm not making any headway. The $tkeys gives me 3 on the third ID, so the for loop runs 3 times, everything makes sense, till the array push where something just decides to stick around. I've even added a print_r to the tempArray and before it runs the third time, it's empty! I dont get where it keeps creeping back in.

Thanks.

Answer 1

Make sure that when you process data in subsequent loops, you remove all previous data...

$sigsort= [];
foreach($tempArray as $sigkey => $sigrow) { 
    $sigsort[$sigkey] = $sigrow['devrssi']; 
}