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; } ?> |