PHP Loop with While Loop confusion - php

Question

I currently have a simple WHILE loop running as follows:
while($los = $result->fetch_row())
{
echo"<tr><td>".$los[0]."</td>";
echo"<td>".$los[1]."</td>";
echo"<td>".$los[2]."</td></tr>";
}
The contents of $los is as follows:
London => 15 => 32
Glasgow => 23 => 45
Leeds => 1 => 12
Truro => 5 => 23
All working fine but what I am struggling with is that I have a second array $outs, the contents of which are:
London => 3
Glasgow => 5
Liverpool => 2
Poole => 1
Within the first while loop I am trying to subtract the value for $outs from $los when the location name matches. I have tried adding the following inside the while loop but no joy:
if($los[0] == $outs[0]){
$los[1] = $los[1]-$outs[1];
}
But no joy, also when I have tried print_r($outs) from within the while loop, all it returns is:
Poole => 1
Poole => 1
Poole => 1
Poole => 1
I cannot fathom where I am going wrong or even if this is possible. Is the $outs array being modified as it's within the first loop? Any ideas, suggestion or pointers welcomed on how I might achieve this.
VAR DUMPS
So, as requested the contents of the two arrays are:
$los
London => 15 => 32
Glasgow => 23 => 45
Leeds => 1 => 12
Truro => 5 => 23
$outs
London => 3
Glasgow => 5
Liverpool => 2
Poole => 1
However, when I vardump or print_r for $outs when it is in the while($los = $result->fetch_row()) the contents are:
Poole => 1
Poole => 1
Poole => 1
Poole => 1
FURTHER CODE
The code to obtain the array for $outs is:
$query19 = "SELECT Country, COUNT(Country), Resp FROM `tresults_` WHERE q39 = 'Complete' GROUP BY Country;";
$result19 = $mysqli->query($query19);
while($row19 = $result19->fetch_assoc()){
$outs = $row19;
}

Answer 1

Please consider to post the RAW Content that was produced by var_dump and include a full but minimal script to produce the error.
What is unclear here seem to be if $outs is a (1) Key-Value Array or a if it's (2) containing sub-arrays.
Option 1:
$outs = [
"London" => 3,
"Glasgow" => 5,
"Liverpool" => 2,
"Poole" => 1
];
Option 2:
$outs = [
["London", 3],
["Glasgow", 5],
["Liverpool", 2],
["Poole", 1]
];
I did for testing assume your input rows look like this:
$citys = [
["London", 15, 32],
["Glasgow", 23, 45],
["Leeds", 1, 12],
["Truro", 5, 23]
];
Depending on this you sould adjust the if inside your while loop.
For option 1:
foreach ($citys as $los) {
if (array_key_exists($los[0], $outs)) {
$los[1] = $los[1] - $outs[$los[0]];
}
echo " <tr><td > " . $los[0] . "</td > ";
echo "<td > " . $los[1] . "</td > ";
echo "<td > " . $los[2] . "</td ></tr > ";
}
For option 2 it's a little bit more code, as we need to search for the cityname index inside $outs first. In php > 5.5 it could be done using array_column which would be easier.
foreach ($citys as $los) {
$indexInOuts = null;
foreach($outs as $index => $out){
if($los[0] === $out[0]){
$indexInOuts = $index;
break;
}
}
if($indexInOuts !== null){
$los[1] = $los[1] - $outs[$indexInOuts][1];
}
echo " <tr><td > " . $los[0] . "</td > ";
echo "<td > " . $los[1] . "</td > ";
echo "<td > " . $los[2] . "</td ></tr > ";
}
The output for both options would be like:
London 12 32
Glasgow 18 45
Leeds 1 12
Truro 5 23
And as stated in the comments you are replacing the $outs every time. So edit it to look like this:
$outs = [];
while ($row19 = $result19->fetch_assoc()) {
$outs[] = $row19;
}