Convert PDF to plain text

Here’s some code that converts PDF to plain text

<?php
 
// new pdf extract
 
print pdf2txt("test.pdf");
 
// Function    : pdf2txt()
// Arguments   : $filename - Filename of the PDF you want to extract
// Description : Reads a pdf file, extracts data streams, and manages
//               their translation to plain text - returning the plain
//               text at the end
// Author      : Jonathan Beckett, 2005-05-02
function pdf2txt($filename){
 
  $data = getFileData($filename);
 
  // grab objects and then grab their contents (chunks)
  $a_obj = getDataArray($data,"obj","endobj");
  foreach($a_obj as $obj){
 
    $a_filter = getDataArray($obj,"<<",">>");
    if (is_array($a_filter)){
      $j++;
      $a_chunks[$j]["filter"] = $a_filter[0];
 
      $a_data = getDataArray($obj,"stream\r\n","endstream");
      if (is_array($a_data)){
        $a_chunks[$j]["data"] = substr($a_data[0],strlen("stream\r\n"),strlen($a_data[0])-strlen("stream\r\n")-strlen("endstream"));
      }
    }
  }
 
  // decode the chunks
  foreach($a_chunks as $chunk){
 
    // look at each chunk and decide how to decode it - by looking at the contents of the filter
    $a_filter = split("/",$chunk["filter"]);
 
    if ($chunk["data"]!=""){
      // look at the filter to find out which encoding has been used      
      if (substr($chunk["filter"],"FlateDecode")!==false){
        $data =@ gzuncompress($chunk["data"]);
        if (trim($data)!=""){
          $result_data .= ps2txt($data);
        } else {
 
          //$result_data .= "x";
        }
      }
    }
  }
 
  return $result_data;
 
}
 
 
// Function    : ps2txt()
// Arguments   : $ps_data - postscript data you want to convert to plain text
// Description : Does a very basic parse of postscript data to
//               return the plain text
// Author      : Jonathan Beckett, 2005-05-02
function ps2txt($ps_data){
  $result = "";
  $a_data = getDataArray($ps_data,"[","]");
  if (is_array($a_data)){
    foreach ($a_data as $ps_text){
      $a_text = getDataArray($ps_text,"(",")");
      if (is_array($a_text)){
        foreach ($a_text as $text){
          $result .= substr($text,1,strlen($text)-2);
        }
      }
    }
  } else {
    // the data may just be in raw format (outside of [] tags)
    $a_text = getDataArray($ps_data,"(",")");
    if (is_array($a_text)){
      foreach ($a_text as $text){
        $result .= substr($text,1,strlen($text)-2);
      }
    }
  }
  return $result;
}
 
 
// Function    : getFileData()
// Arguments   : $filename - filename you want to load
// Description : Reads data from a file into a variable
//               and passes that data back
// Author      : Jonathan Beckett, 2005-05-02
function getFileData($filename){
  $handle = fopen($filename,"rb");
  $data = fread($handle, filesize($filename));
  fclose($handle);
  return $data;
}
 
 
// Function    : getDataArray()
// Arguments   : $data       - data you want to chop up
//               $start_word - delimiting characters at start of each chunk
//               $end_word   - delimiting characters at end of each chunk
// Description : Loop through an array of data and put all chunks
//               between start_word and end_word in an array
// Author      : Jonathan Beckett, 2005-05-02
function getDataArray($data,$start_word,$end_word){
 
  $start = 0;
  $end = 0;
  unset($a_result);
 
  while ($start!==false && $end!==false){
    $start = strpos($data,$start_word,$end);
    if ($start!==false){
      $end = strpos($data,$end_word,$start);
      if ($end!==false){
        // data is between start and end
        $a_result[] = substr($data,$start,$end-$start+strlen($end_word));
      }
    }
  }
  return $a_result;
}
 
?>

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