如何将此文本转换为所需的数组格式并在csv中导出？

Question

I have this text extracted from pdf using pdftotext tool

Please find below text structure

stage    title1    title2  title3  title4
I        value1    value2  value3  
II                         value5  value6

stage    Other1      Other2     Other3     Other4
I        otherval1   otherval2  otherval3  otherval4

Now I want to export this text in CSV format using appropriate columns and headers this way or build an array this way

[
  "category" => "title1",
  "score"    => "value1",
],
[
  "category" => "title2",
  "score"    => "value2",
],
[
  "category" => "title3",
  "score"    => "value3"
],
// unable to to do this
[
  "category" => "title3",
  "score"    => "value5"
],
[
  "category" => "title4",
  "score"    => "value6",
],

.
.
// so on

Now the problem is

• Column values in I stage and II stage are optional, but any one of the rows will contain at least one value for each column
• Stage II row is optional, may exist or not
• If stage II row exists then at least one column value exists in the row

The problem I am facing is how can I map

• value5 to title3
• value6 to titl4

Here is my parser code (PHP)

$rows = explode("
", $pdfExtractedText);
$rows = array_values(array_filter($rows));

$categories = array_values(array_filter(explode(" ", $rows[7])));
$stage1Scores = array_values(array_filter(explode(" ", $rows[8])));
$stage2Scores = array_values(array_filter(explode(" ", $rows[9])));
var_dump($categories);
var_dump($stage1Scores);
var_dump($stage2Scores);

OUTPUT:

// categories
array:13 [
  0 => "stage"
  1 => "title1"
  2 => "title2"
  3 => "title3"
  4 => "title4"
]

//values - Index preserved so that I can map with categories
array:14 [
  0 => "I"
  1 => "value1"
  2 => "value2"
  3 => "value3"
  4 => "value4"
]

// index not preserved :(
array:2 [
  0 => "II"
  1 => "value5",
  2 => "value6"
]

Answer 1

Then try this,

$csv = "";

$csv .= implode("," , $categories) . PHP_EOL; 
$csv .= implode("," , $stage1scores) . PHP_EOL;
$csv .= implode("," , $stage2scores) . PHP_EOL;

Then write it to a file.