PHP multiple substr on string

Question

I have a string for which I am provided a string index.

I am creating a process to read it and I am wondering if there is a php function that exists that I have overlooked or an unaware of to perform this process far more easily.

$data:

Invoice No..... Sale Type Desc...... Misc Amt.... Misc Acc.. Misc Acc Desc.....................................

FOCF219611      CUSTOMER                    -0.02 8050       TOOLS & SUPPLIES - SERVICE
FOCF219669      CUSTOMER                   -14.49 8050       TOOLS & SUPPLIES - SERVICE

$fieldIndexes:

Array (
  [0] => 15 
  [1] => 20 
  [2] => 12 
  [3] => 10
  [4] => 50
)

Split $data into $headers array:

array_push($headers, substr($data, 0, $fieldIndexes[0]));
array_push($headers, substr($data, $fieldIndexes[0], $fieldIndexes[1]));
array_push($headers, substr($data, $fieldIndexes[1], $fieldIndexes[2]));
array_push($headers, substr($data, $fieldIndexes[2], $fieldIndexes[3]));
array_push($headers, substr($data, $fieldIndexes[3], $fieldIndexes[4]));

Is there a function that can remove part of a string - like array_shift for a string? I was thinking I could loop the $fieldIndexes, extract the first length from the start of the string, and so on until the string is empty and condense this into 3 lines and make it portable for any number of fieldIndexes?

Desired Result:

Array
(
[HEADERS] => Array
    (
        [0] => Invoice No
        [1] => Sale Type Desc
        [2] => Misc Amt
        [3] => Misc Acc
        [4] => Misc Acc Desc

    )

[1] => Array
    (
        [Invoice No] => FOCF219611
        [Sale Type Desc] => CUSTOMER
        [Misc Amt] => -0.02
        [Misc Acc] => 8050
        [Misc Acc Desc] => TOOLS & SUPPLIES - SERVICE

    )
)                      

Answer 1

You can create a function like this one to split using the chunk sizes. Note: Since each size in the $fieldIndexes array didn't include the space between columns, I added one to each length (15+1, 20+1, ...)

<?php

$headerString ="Invoice No..... Sale Type Desc...... Misc Amt.... Misc Acc.. Misc Acc Desc.....................................";
$fieldIndexes = [ 15+1, 20+1, 12+1, 10+1,  50+1];


function getParts($string, $positions){
    $parts = array();

    foreach ($positions as $position){
        $parts[] = substr($string, 0, $position);
        $string = substr($string, $position);
    }

    return $parts;
}

print_r(getParts($headerString, $fieldIndexes));
?>

Result:

Array
(
    [0] => Invoice No..... 
    [1] => Sale Type Desc...... 
    [2] => Misc Amt.... 
    [3] => Misc Acc.. 
    [4] => Misc Acc Desc.....................................
)