Help with pdf to text code

[mikebyrne]

I'm trying to modify a piece of code to allow me to take the contents of a pdf document and send the output to a textfile

 

My code is

 

<?php
// 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
// Authors      : Jonathan Beckett, 2005-05-02
//                            : Sven Schuberth, 2007-03-29

function pdf2txt($filename){    

    $pdftext = pdf2txt('C:\Users\Mike\Desktop\Athy Database\Athy Register.pdf');

    $data = getFileData($filename);
   
    $s=strpos($data,"%")+1;
   
    $version=substr($data,$s,strpos($data,"%",$s)-1);
    if(substr_count($version,"PDF-1.2")==0)
        return handleV3($data);
    else
        return handleV2($data);

   
}
// handles the verson 1.2
function handleV2($data){
       
    // 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;
}

//handles versions >1.2
function handleV3($data){
    // grab objects and then grab their contents (chunks)
    $a_obj = getDataArray($data,"obj","endobj");
    $result_data="";
    foreach($a_obj as $obj){
        //check if it a string
        if(substr_count($obj,"/GS1")>0){
            //the strings are between ( and )
            preg_match_all("|\((.*?)\)|",$obj,$field,PREG_SET_ORDER);
            if(is_array($field))
                foreach($field as $data)
                    $result_data.=$data[1];
        }
    }
    return $result_data;
    
}

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($filename){
    $handle = fopen($filename,"rb");
    $data = fread($handle, filesize($filename));
    fclose($handle);
    return $data;
}

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;
}
error_reporting(E_ALL);
ini_set('display_errors', TRUE);

file_put_contents('txtfile.txt', pdf2txt('Athy Register.pdf'));
?>

 

When I run the code it jst seems to freeze, any idea why??

[GingerRobot]

When I run the code it jst seems to freeze, any idea why?

 

Yes. You're calling the function (pdf2txt()) from within itself, with no condition for breaking out. So the function is being recursively called indefinitely.

[mikebyrne]

I'm a function noobie, how should it be written?

[GingerRobot]

Well I assume you should move this line:

 

$pdftext = pdf2txt('C:\Users\Mike\Desktop\Athy Database\Athy Register.pdf');

 

To outside of all the functions. Not having written or looked at the code, I can't guarantee that will work for you, however.

[mikebyrne]

That seems to have fixed the problem with the code not loading bt im getting the error

 

Notice: Undefined variable: j in C:\xampp\htdocs\pdf2txt_test.php on line 38

 

$j++;

 

Any idea how I can fix this?

[Mark Baker]

That seems to have fixed the problem with the code not loading bt im getting the error

 

Notice: Undefined variable: j in C:\xampp\htdocs\pdf2txt_test.php on line 38

 

$j++;

 

Any idea how I can fix this?

Initialize $j before you use it

    $j = -1;
    foreach($a_obj as $obj){
       
        $a_filter = getDataArray($obj,"<<",">>");
   
        if (is_array($a_filter)){
            $j++;

[mikebyrne]

Thanks that seemed to fix it

 

Im now getting the error

 

Notice: Undefined variable: a_result in C:\xampp\htdocs\pdf2txt_test.php on line 140

 

line 140 is in the function

 

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;

 

 

 

[Mark Baker]

Im now getting the error

 

Notice: Undefined variable: a_result in C:\xampp\htdocs\pdf2txt_test.php on line 140

 

Quite logical

The line

unset($a_result);

basically says delete the variable $a_result, but $a_result doesn't actually exist at that point, so it can't be deleted. To fix it, simply remove that line.

 

However, to pre-empt your next question after you've done that, the code then tries to store values in the $a_result array, which doesn't yet exist.... the one that unset($a_result); tried to destroy but couldn't because it didn't exist.

Instead of simply removing the unset() line, replace it with

$a_result = array();

 

[mikebyrne]

I'm noe getting the error

 

 

Notice: Undefined offset: 0 in C:\xampp\htdocs\pdf2txt_test.php on line 40

 

Notice: Undefined offset: 0 in C:\xampp\htdocs\pdf2txt_test.php on line 44

 

Notice: Undefined offset: 0 in C:\xampp\htdocs\pdf2txt_test.php on line 46

 

The lines are in the function

 

function handleV2($data){
       
    // grab objects and then grab their contents (chunks)
    $a_obj = getDataArray($data,"obj","endobj");
   
     $j = -1;
    foreach($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"));
            }