Sum up array first, then push into array loop solution - php

Question

I had a problem with this particular code. The conditions are:
When $rows['Machine#'] is not in array, push in $machineArr array and unset the $totalTimeArr array.
When $rows['Machine#'] is in the array, push $rows['TotalTime'] into $totalTimeArr array for addition.
$graphArr[] should be updated (for array_sum($totalTimeArr)) first before push into array.
only one $graphArr[] for each machine
I now have problems regarding the third condition. It does not calculate first, instead it pushes the first data input. I have tried using do while loop, putting $graphArr[] = '["'.$rows['Machine#'].'",'.array_sum($totalTimeArr).']'; outside the if else loop, but this seems to be the closest I can get to what it's supposed to be. Other codes don't seem to have any problems and work well. Appreciate your recommendations/suggestions/assistance. Below is the code.
while ($rows = mysqli_fetch_array($conn))
{
if(!(in_array($rows['Machine#'], $machineArr)))
{
unset($totalTimeArr);
$machineArr[] = $rows['Machine#'];
$totalTimeArr[] = $rows['TotalTime'];
$graphArr[] = '["'.$rows['Machine#'].'",'.array_sum($totalTimeArr).']';
}
else if(in_array($rows['Machine#'], $machineArr))
{
$totalTimeArr[] = $rows['TotalTime'];
}
}
EDIT: I'm currently on this:
while ($rows = mysqli_fetch_array($conn))
{
$exists = false;
if( in_array($rows['Machine#'], $machineArr) )
{
$exists = true;
}
$totalTimeArr[] = $rows['TotalTime'];
if($exists === false)
{
$totalTimeArr = array();
$machineArr[] = $rows['Machine#'];
$totalTimeArr[] = $rows['TotalTime'];
}
$graphArr[] = '["'.current($machineArr).'",'.array_sum($totalTimeArr).']';
next($machineArr);
}
The result:
Array ( [0] => ["09CS1", 1.4]
[1] => ["08CS1", 1 ]
[2] => ["06CS1", 1 ]
[3] => ["" , 1.5]
[4] => ["02CS2", 1 ]
[5] => ["01CS2", 20 ]
[6] => ["" , 40 ]
[7] => ["01CS1", 1 ]
)
How do I remove ["", 1.5] and ["", 40]?
Below is the database:

Answer 1

I'm not sure what you need to do, if you need a running sum for a specific type of a machine then do something like:
$totalTileArr = [];
while ($rows = mysqli_fetch_array($conn)) {
if (!isset($totalTileArr[$rows['Machine#']])) {
$totalTileArr[$rows['Machine#']] = [];
}
$totalTimeArr[$rows['Machine#']][] = $rows['TotalTime'];
$graphArr[$rows['Machine#']] = '["' . $rows['Machine#'] . '",' . array_sum($totalTimeArr[$rows['Machine#']]) . ']';
}

Answer 2

A slightly modified version of your code cleaned up
$machineArr = Array();
while ($rows = mysqli_fetch_array($conn)) {
$exists = false;
if( in_array($rows['Machine#'], $machineArr) ) { $exists = true; }
$totalTimeArr[] = $rows['TotalTime'];
if($exists === false) {
unset($totalTimeArr);
$machineArr[] = $rows['Machine#'];
$totalTimeArr[] = $rows['TotalTime'];
$graphArr[] = '["'.$rows['Machine#'].'",'.array_sum($totalTimeArr).']';
}
}
Converted the check into one in_array() search, then comparing using === bitwise operator to evaluate the condition. Also defined $machineArr as an Array() as the first check in your loop would always fail given that $machineArr was (presumably as I don't see the code prior to the while loop) undefined.