Split Number by a number format - php

Question

I truly thinking too long to find the logic/ algorithm to do this thing. Then I just use if else but I know this is bad because there will be too much statement.
I have number format group below to split the input number :
01 (Get 14 digits after this number format)
3101 (Get 6 digits after this number format)
3102 (Get 6 digits)
3202 (Get 6 digits)
13 (Get 6 digits)
15 (Get 6 digits)
11 (Get 6 digits)
21 (Get the rest)
Some of rules :
01 always in first sequence
21 always in last sequence
other number format except 01 and 21 can be in any sequence position.
The same prefix number format cannot be repeat
example, Input Number : 010069008517306731020020001319100421191004091395
The Result Should be :
01 : 00690085173067
3102 : 002000
13 : 191004
21 : 191004091395
Currently I only use IF ELSE statement to get the digits after.
This is my pieces of code using PHP. This code can only handle that example input above. There will be possibility of other sequence number format as per rules, but it will difficult if only use if else statement like this.
$first = substr($input, 0, 2);
if ($first == 01) {
$itemCode = substr($input, 2, 14); // get the 6 digits after 01
$second = substr($input, 16, 4);
if ($second == 3102) {
$quantity = substr($input, 20, 6); // get the 6 digits after 3102
$third = substr($input, 26, 2);
if ($third == 13) {
$packedDate = substr($input, 28, 6); // get the 6 digits after 13
$fourth = substr($input, 34, 2);
if ($fourth == 21) {
$serialNumber = substr($scanner, 36); // get the rest number after 21
}
}
}
}
Is there any good way to solve this thing?

Answer 1

If the prefixes won't repeat, you can use preg_match_all to match the prefixes with each of their trailing digits, using array_combine to create arrays of digits indexed by their prefixes:
$input = '010069008517306731020020001319100421191004091395';
if (preg_match_all('/(01)(\d{14})|(310[12]|3202|1[135])(\d{6})|(21)(\d+)/', $input, $matches)) {
$numbers = array_filter(array_combine($matches[1], $matches[2]) +
array_combine($matches[3], $matches[4]) +
array_combine($matches[5], $matches[6]));
print_r($numbers);
}
else {
echo "Invalid input!";
}
Output:
Array
(
[01] => 00690085173067
[3102] => 002000
[13] => 191004
[21] => 191004091395
)
Demo on 3v4l.org