Undefined index error while key exists in array - php

Question

I'm pulling my hair on a proble which seems very simple, but I can't find a solution.
I have a simple $row array here :
array:2 [▼
"reference" => "ABCDEF"
"quantity" => "10"
]
I'm trying to parse it and retrieve quantities per reference using :
$line = [
'ref' => strtoupper($row["reference"]),
'quantity' => $row["quantity"]
];
I'm looping through array of lines using this code:
foreach ($rows as $row) {
$line = [
'ref' => strtoupper($row['reference']),
'quantity' => $row['quantity']
];
}
As a test, my main array $rows has 2 lines :
^ array:3 [▼
0 => array:2 [▼
0 => "ABCDEF"
1 => "10"
]
1 => array:2 [▼
0 => "WXCVBN"
1 => "3"
]
2 => array:1 [▼
0 => null
]
]
However, I'm getting the following error :
Undefined index: reference
Strangely enough, if I comment out the
'ref' => strtoupper($row["reference"]),
line, I can get the "quantity" value with no issue...
I know the key is in there, since the debug of the $row object gives the above result.
It must be dead simple... but I can't find the solution...
If anyone could please help ?

Answer 1

So apparently the $row variable a row from a bigger array that is used in a foreach loop.
This might be the solution to your problem.
$array = [
[ "reference" => "ABC", "quantity" => "10"],
[ "reference" => "ABC", "quantity" => "10"],
[ "reference" => "ABC", "quantity" => "10"],
];
$line[] = '';
foreach($array as $row)
{
$line['ref'] = $row['reference'];
$line['quantity'] = $row['quantity'];
}
In this example $array is your bigger array, i use it to test the example.
After that i create a empty array $line to append the "new" data.
Could you try this?
Edit:
After taking a look at your loop and the array i noticed that your array doesnt have a reference key. Can you try strtoupper(row[0])?

Answer 2

Viewing your code seems that you convert $row array to $line without rewrite key in new array.
your code
foreach ($rows as $row) {
$line = [
'ref' => strtoupper($row['reference']),
'quantity' => $row['quantity']
];
}
With your rewrite you can access $line data by index, not by key
array:3 [▼
0 => array:2 [▼
0 => "ABCDEF"
1 => "10"
]
...
]
My solution
If you want to access your $line data by key, you need to rewrite your loop as:
foreach($rows as $rowData) {
foreach($rowData as $rowKey => $rowValue) {
$data = [
'ref' => $rowKey => strtoupper$($rowValue),
'quantity' => $row['quantity']
];
}
$line[] = $data;
}