Create a 3D array from a list - php

Question

I have the following list:
1945/01/05 BA 87 34 1 59 50
1945/01/05 CA 18 17 45 49 82
1945/01/13 BA 6 66 1 16 48
1945/01/13 CA 40 60 32 50 80
and so on....
I want to arrange them as an array like the following:
$array['BA'][0][0] = 87;
$array['BA'][0][1] = 34;
$array['BA'][0][2] = 1;
$array['BA'][0][3] = 59;
$array['BA'][0][4] = 50;
$array['CA'][0][0] = 18;
$array['CA'][0][1] = 17;
$array['CA'][0][2] = 45;
$array['CA'][0][3] = 49;
$array['CA'][0][4] = 82;
$array['BA'][1][0] = 6;
$array['BA'][1][1] = 66;
$array['BA'][1][2] = 1;
$array['BA'][1][3] = 16;
$array['BA'][1][4] = 48;
$array['CA'][1][0] = 48;
$array['CA'][1][1] = 60;
$array['CA'][1][2] = 32;
$array['CA'][1][3] = 50;
$array['CA'][1][4] = 80;
I know that I can use preg_split('/\s+/', $list); to create an array, but how can I create a 3D Array from this list?
Thank you for your help

Answer 1

Try something like this:
Updated the code so you can also load a file since you have memory issues.
Consider: If loading the amount of data already creates memory issues your end result, the array, might also generate memory issues! Since that's even more data!
So this will read per line so it does not load the total file in memory directly. But since you have memory issues you should likely not write to an array but to a database for example. Otherwise the memory issue will keep coming.
<?PHP
/*
* Example when small amount of data is in a string
*/
/*
//your input
$str='1945/01/05 BA 87 34 1 59 50
1945/01/05 CA 18 17 45 49 82
1945/01/13 BA 6 66 1 16 48
1945/01/13 CA 40 60 32 50 80';
//we work per line
$lines=explode("\n", $str);
//loop each line
foreach($lines AS $line) {
*/
/*
* Example when big amount of data is in a file
*/
//this will contain the end result
$result=array();
$filename='lines.txt'; //contains the data like in your question
$fp = fopen($filename,'r');
while($line=fgets($fp)) {
//explode each line on space so we get the different fields
$fields=explode(' ', $line);
//we remove the date, not needed
unset($fields[0]);
//we get the key (BA/CA/etc) and remove it also
$key=$fields[1];
unset($fields[1]);
//we write the result to the array
//using array_values so the indexes are from 0-4 again
//because we removed items
$result[$key][]=array_values($fields);
}
fclose($fp);
//show the result in html
echo '<pre>';
print_r($result);
THE QUESTION CHANGED
This does answer the question asked in the comments, not the actual question.
<?PHP
/*
* Example when big amount of data is in a file
*/
//this will contain the end result
$result=array();
$filename='lines.txt'; //contains the data like in your question
$fp = fopen($filename,'r');
while($line=fgets($fp)) {
//explode each line on space so we get the different fields
$fields=explode(' ', $line);
//we remove the date, not needed
unset($fields[0]);
//we get the key (BA/CA/etc) and remove it also
$key=$fields[1];
unset($fields[1]);
//We start counting the numbers
foreach($fields AS $nr) {
$nr=trim($nr);
if(empty($result[$key][$nr])) {
$result[$key][$nr]=1;
}else{
$result[$key][$nr]++;
}
}
}
fclose($fp);
//show the result in html
echo '<pre>';
print_r($result);

Answer 2

<?php
$a = '1945/01/05 BA 87 34 1 59 50
1945/01/05 CA 18 17 45 49 82
1945/01/13 BA 6 66 1 16 48
1945/01/13 CA 40 60 32 50 80';
$array = array();
$list = explode("\n", $a);
echo '<pre>';
print_r($list);
echo '</pre>';
$first_index = 0;
$counter = 0;
foreach($list as $key=>$value) {
if($counter >=2) {
$first_index++;
$counter= 0;
}
$row = explode(" ",$value);
$k = $row[1];
for($i=2; $i< count($row); $i++) {
$array[$k][$first_index][] = $row[$i];
}
$counter++;
}
echo '<pre>';
print_r($array);
echo '</pre>';
?>