如何在PHP中逐行读取文件并跳过一些中间换行符

Question

这是我在这里的第一个问题。我有这样的文件(从itunes导出的epf数据)，例如EPF dataset

列由SOH (ASCII字符1)分隔，行由STX (ASCII字符2) +“n”分隔。一切都很好，但应用程序的描述是多行的，并且包含行尾字符。所以问题是当我试图逐行读取文件时

  $fn = fopen("application_stripped","r");

  while(! feof($fn))  {
    $result = fgets($fn);
    print_r($result);
  }

  fclose($fn);

它检测第一个行尾(即描述中的行尾)，但不会检测行尾的实际行尾符号。输入文件非常大(最多4-5 5gb)。你知道该怎么处理它吗？

PS:对不起，我的英语！:-)

Answer 1

感谢大家的帮助，看起来我能处理好这个问题。下面是我所做的代码

$columnBreakpoint = 17;
$handle = @fopen("inputfile.txt", "r");
if ($handle) {

  #export_date
  #application_id
  #title
  #recommended_age
  #artist_name
  #seller_name
  #company_url
  #support_url
  #view_url
  #artwork_url_large
  #artwork_url_small
  #itunes_release_date
  #copyright
  #description
  #version
  #itunes_version
  #download_size

  $fileSeekPointer = 0;
  while(! feof($handle))  {
    // Reading a part of string
    $result = stream_get_line($handle, 10000);

    $positions = array();
    $pos = -1;
    // Detecting all the positions of the column separator symbol
    while (($pos = strpos($result, "\x01", $pos + 1)) !== false) {
      $positions[] = $pos;
    }
    // Getting 17th column separator position, because each product line must contain at least 17 columns
    $breakpointPos = $positions[$columnBreakpoint];
    // Stripping the line by this position
    $resultS = substr($result, 0, $breakpointPos);
    // Detecting position of end-of-line symbol in substring and strip by it
    $eolPos = strrpos($resultS, PHP_EOL);
    $resultS = substr($resultS, 0, $eolPos);
    // Now we must find the first position after actual EOL symbol
    $fileSeekPointer += ($breakpointPos + ($eolPos - $breakpointPos)) + 1;
    // And set file pointer on the first position after actual end of line
    fseek($handle, $fileSeekPointer);

    print '------------------'."\n";
    var_dump($resultS);
  }

  fclose($handle);
}