PHP Create a Nested Array with indexes from a CSV file - php

Question

I'm having a peculiar issue. I have a CSV file that has Comma Separated Values that I need to upload and then get Nested Array of values based on following 3 conditions;
The array will first loop through all values and get first 4 unique
characters. (Codes)
Match each column values with the with number of
columns in each row and give count of rows that matches 4 digit
codes. (Single_Devices for single column and Dual, Triple and Quad for respective columns count)
Match each column values with code and list all the
columns under the Devices. (Numbers)
CSV file
123429000000000
123429000000001
123429000000010,123429000000011
123429000000040,123429000000041
What I desire is;
Array
(
[Code] => 1234
(
[single_devices] => 2
(
[0] => Array
(
[0] => 123429000000000
)
[1] => Array
(
[0] => 123429000000001
)
)
[dual_devices] => 2
(
[0] => Array
(
[0] => 123429000000010
[1] => 123429000000011
)
[1] => Array
(
[0] => 123429000000040
[1] => 123429000000041
)
)
)
)
Is it possible?
I can manage JSON converted data or object or just associative nested array.
Edit: This is the code I wrote for which was only showing values and not indexes as I desired.
// Get all numbers in array
for ($j = 0; $j < count($csv_file[$i]); $j++){
$numbers[] = $csv_file[$i][$j];
}
// Get codes from numbers
for ($i = 0; $i < count($csv_file); $i++){
for ($j = 0; $j < count($csv_file[$i]); $j++){
$codes[] = substr($csv_file[$i][$j], 0, 4);
}
}
// Get unique codes from codes array
$codes = array_unique($codes);
// Get numbers and sort them codes and device count wise.
for ($i = 0; $i < count($csv_file); $i++){
for ($j = 0; $j < count($csv_file[$i]); $j++){
$q = count($csv_file[$i]); // set device count based on column count
if (count($csv_file[$i]) == $q){ // if device count is equal to column count
foreach ($codes as $code){ // loop through unique codes
if ($code == substr($csv_file[$i][$j], 0, 4)){ // if number's first 4 char matches code
// create array with code and then device count and add numbers
$devices[$code][$q.'_device_numbers'][$i][$j] = preg_replace('/\s+/', '', $csv_file[$i][$j]);
}
}
}
}
}
This is what I am getting from the above code.
Array
(
[1234] => Array
(
[1_sim_imeis] => Array
(
[0] => Array
(
[0] => 123429000000000
)
[1] => Array
(
[0] => 123429000000001
)
)
[2_sim_imeis] => Array
(
[2] => Array
(
[0] => 123429000000010
[1] => 123429000000011
)
[3] => Array
(
[0] => 123429000000040
[1] => 123429000000041
)
)
)
)

Answer 1

This is based on reading the file as a csv (using fgetcsv()) and extracting the first 4 digits of the first value on each line. It then uses another array to give the key for the 'single_devices' etc. key - using the count of the number of elements on the line (-1 as the array is 0 based)...
$fileName = "a.dat";
$output = [];
$baseData = [ 'single_devices', 'dual_devices', 'triple_devices', 'quad_devices' ];
$fh = fopen ( $fileName, "r" );
while ( ($data = fgetcsv($fh)) !== false ) {
$code = substr($data[0], 0, 4);
$output[$code][$baseData[count($data)-1]][] = $data;
}
fclose($fh);
print_r($output);
which with the test data gives...
Array
(
[1234] => Array
(
[single_devices] => Array
(
[0] => Array
(
[0] => 123429000000000
)
[1] => Array
(
[0] => 123429000000001
)
)
[dual_devices] => Array
(
[0] => Array
(
[0] => 123429000000010
[1] => 123429000000011
)
[1] => Array
(
[0] => 123429000000040
[1] => 123429000000041
)
)
)
With
while ( ($data = fgetcsv($fh)) !== false ) {
$code = substr($data[0], 0, 4);
if ( !isset($output[$code])) {
$output[$code] = ["code" => $code];
}
$deviceLabel = $baseData[count($data)-1];
$output[$code][$deviceLabel]['count'] =
($output[$code][$deviceLabel]['count'] ?? 0) + 1;
$output[$code][$deviceLabel][] = $data;
}
you can get an output of...
Array
(
[1234] => Array
(
[code] => 1234
[single_devices] => Array
(
[count] => 2
[0] => Array
(
[0] => 123429000000000
)
[1] => Array
(
[0] => 123429000000001
)
)