Parse DTA file of fixed format (see spec here http://www.six-interbank-clearing.com/dl_tkicch_dta.pdf). This script parses only transactions 830 and 836 with 5 segments and total amount of transactions (890)

parse_dta.php

<?php
function parse_header($file) {
  $header = array();
  $header['requested_precissing_date'] = fread($file, 6);
  $header['benef_bank_clearing_no'] = fread($file, 12);
  $header['output_sequence_number'] = fread($file, 5);
  $header['creation_date'] = fread($file, 6);
  $header['order_bank_clearing_no'] = fread($file, 7);
  $header['data_file_ident'] = fread($file, 5);
  $header['entry_sequence_nubmer'] = fread($file, 5);
  $header['transaction_type'] = fread($file, 3);
  $header['payment_type'] = fread($file, 1);
  $header['processing_flag'] = fread($file, 1);
  
  return $header;
}


$f = fopen('public://DTAFILE.DTA', 'r');
$content = array();

while(!feof($f)) {
  $output = array();
  $output['SOH'] = fread($f, 2);
  $output['header'] = parse_header($f);
  $tt = $output['header']['transaction_type'];
  $output['segments'][] = fread($f, 75); 
  if ($tt != 890) {
    $output['segments'][] = fread($f, 128);
    $output['segments'][] = fread($f, 128);
    $output['segments'][] = fread($f, 128);
    $output['segments'][] = fread($f, 128);
  }
  $content[] = $output;
}

fclose($f); 
dpm($content);