Undefined offset error help

mikebyrne · August 11, 2009

Im working on a pdf to textfile program and I'm getting the following errora

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"));
            }

My complete 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

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


function pdf2txt($filename){    

    $data = getFileData($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");
   
     $j = -1;
    foreach($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"));
            }
        }
    }

    // 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;
    $a_result = array();
   
    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'));
?>

Any help on this would be great

Adam · August 11, 2009

The following are not set:

$a_filter[0]

$a_data[0]

Perhaps use print_r or var_dump to check the contents of the array.

Mark Baker · August 11, 2009

if ((is_array($a_filter)) && (count($a_filter) > 0)) {

instead of simply

if (is_array($a_filter)){

a couple of lines above

mikebyrne · August 11, 2009

I've replaced that line but im still getting two errors

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

Its got rid of one error

Line 44 is

$a_chunks[$j]["data"] = substr($a_data[0],

Line 46 is

strlen($a_data[0])-strlen("stream\r\n")-strlen("endstream"));

Adam · August 11, 2009

Apply the same kind of check to line 43.

mikebyrne · August 11, 2009

Something like

if ((is_array($a_data)) && (count($a_data) > 0)) {

Adam · August 11, 2009

Yes.

mikebyrne · August 11, 2009

That throws up the error

Notice: Undefined index: data in C:\xampp\htdocs\pdf2txt_test.php on line 57

Line 57 is

if ($chunk["data"]!=""){

Adam · August 11, 2009

Try using...

if (isset($chunk['data'])) {

As I mentioned before, I think it would be worth dumping the data within the arrays just to make sure you're getting back what you expect.

mikebyrne · August 11, 2009

Down to only ONE error now!

Notice: Undefined variable: result_data in C:\xampp\htdocs\pdf2txt_test.php on line 71

Line 71 is

return $result_data;

Adam · August 11, 2009

Again check that the variable is set before returning it:

if (isset($result_data)) {
    return $result_data;
} else {
    return false;
}

mikebyrne · August 11, 2009

That seemed to fix the problem. I'm getting a blank screen but the textfile isnt created??

Adam · August 11, 2009

That's why I've been saying to dump the data. Obviously you've improved the code, but from the sounds of it it's failing virtually every conditional and so the script isn't actually doing a great deal. Need to debug the code and find out exactly where it's going wrong.

mikebyrne · August 11, 2009

Would i need to dump the data into seperate files after every function? (to see whats happening at each stage)

If so, how would i code that?

Adam · August 11, 2009

No just use print_r or var_dump within the script to show the contents of the array/variable. Testing different arrays in different areas of the script will build up a picture of what's happening behind the scenes. For example after you call the getDataArray() function, print out the data returned. Obviously you'll see then if it's returned the data as expected or returned null / false, which tells you where the problem is. To be honest I think it's that function causing the problems anyway.

If you still feel a little lost, have a read through this tutorial and see if it helps - particularly the 'logical errors' section:

http://www.phpfreaks.com/tutorial/debugging-a-beginners-guide

mikebyrne · August 11, 2009

I've put the print_r after each function but im still getting a blank screen

<?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

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


function pdf2txt($filename){    

    $data = getFileData($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");
   
     $j = -1;
    foreach($a_obj as $obj){
       
        $a_filter = getDataArray($obj,"<<",">>");
   
        if ((is_array($a_filter)) && (count($a_filter) > 0)) {
            $j++;
            $a_chunks[$j]["filter"] = $a_filter[0];

            $a_data = getDataArray($obj,"stream\r\n","endstream");
            if ((is_array($a_data)) && (count($a_data) > 0)) {
                $a_chunks[$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 (isset($chunk['data'])) {
            // look at the filter to find out which encoding has been used           
            if (substr($chunk["filter"],"FlateDecode")!==false){
                $data =@ gzuncompress($chunk["data"]);
                if (trim($data)!=""){
                    $result_data .= ps2txt($data);
                } else {
               
                    //$result_data .= "x";
                }
            }
        }
    }
   
    if (isset($result_data)) {
    return $result_data;
} else {
    return false;
}
}

//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 $result_data;
    print_r ($a_result);
    
}

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 $result;
    print_r ($result);
}

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

function getDataArray($data,$start_word,$end_word){

    $start = 0;
    $end = 0;
    $a_result = array();
   
    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 $a_result;
    print_r ($a_result);
}
error_reporting(E_ALL);
ini_set('display_errors', TRUE);

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

premiso · August 11, 2009

Mike,

You have your print_r after a return statement in the function. That will never happen.

   return $data;
   print_r ($data);

Should be:

  print_r ($data);
return $data;

That will show data and allow you to check to make sure that everything is going through properly.

mikebyrne · August 11, 2009

Thanks

I'm just getting a mountain of nonsense ie

%PDF-1.2 %âãÏÓ 1 0 obj << /Type /Catalog /Pages 2 0 R /PageMode /UseNone /ViewerPreferences << /FitWindow true /PageLayout /SinglePage /NonFullScreenPageMode /UseNone >> >> endobj 2 0 obj << /Type /Pages /Kids [ 8 0 R 30 0 R 40 0 R 44 0 R 48 0 R 52 0 R 56 0 R 60 0 R 64 0 R 68 0 R 72 0 R 76 0 R 80 0 R 84 0 R 88 0 R 92 0 R 96 0 R 100 0 R 104 0 R 108 0 R 112 0 R 116 0 R 120 0 R 124 0 R 128 0 R 132 0 R 136 0 R 140 0 R 144 0 R 148 0 R 152 0 R 156 0 R 160 0 R 164 0 R 168 0 R 172 0 R 176 0 R 180 0 R 184 0 R 188 0 R 192 0 R 196 0 R 200 0 R 204 0 R 208 0 R 212 0 R 216 0 R 220 0 R 224 0 R 228 0 R 232 0 R 236 0 R 240 0 R 244 0 R 248 0 R 252 0 R 256 0 R 260 0 R 264 0 R 268 0 R 272 0 R 276 0 R 280 0 R 284 0 R 288 0 R 292 0 R 296 0 R 300 0 R 304 0 R 308 0 R 312 0 R 316 0 R 320 0 R 324 0 R 328 0 R 332 0 R 336 0 R 340 0 R 344 0 R 348 0 R 352 0 R 368 0 R 372 0 R 376 0 R 380 0 R ] /Count 85 /MediaBox 3 0 R /CropBox 4 0 R >> endobj 3 0 obj [ 0 0 595 841 ] endobj 4 0 obj [ 0 0 595 841 ] endobj 5 0 obj << /Length 1701 /Filter [ /FlateDecode ] >> stream xœÅ™ÛrÛ6†ïù¸«3ã*�€@{åSÓC’¦–ÓÜø¦)‹ .I9£Çë›'@‰±"³S{ÆÚßZ°X`IÂ¤�êßÖˆóàõeò”ÆÉõ›s×Cu±0ø5øÊš‹º¿Ë‹�Cð% ,L„äBaÈ¬È‚eðxþJÂPd¯„ÌŠþJ#€¥X9®[Fî*ã—ëàSP<-ˆðP7°²œê;G+F"‹‡iäTÖ*ÊÕe™stÂv¯.Ý4+‚¸Yí©ãàü&@&‚™þ·þQÁq+nòàä:yHë&©@¹WY7eUƒWàæ¯àêFÃy) ¼Fõ¼Pxób5ð†!Ä=/¢ï/X•Uœ€UUæêëf ~Jîª¬¶�C(@SªÙöÿ‹àÎ€Bª9C!5 ÊY+²VPÁ”pnV91ì†2Î†Ã¹”i.Ê¢nÒf“ñö‡]TAõrÂ"ìPèPÕÜÖÍ‰cQ íQ „|ˆz‘6[ðZÁnŠf&ƒz8L§SŽÍ:¾T·1 ú[šÝË*™ t1Gó¨z«l ã‹¢îŽ£îÁ²Ü4ë‰€cÎúµiDpLqp'Ž x¢ŽRå±Gù¡Ì²´x�—jƒ¨Ò¸Ù¹Jv3Q|EZtK‡BÏ®u³âHRŒ9íçôjS•‰,ÀYe©Ì“¢y&©Ôeð€ãÁs».Œ›Ç’‡‘èçX„l2©ÀÛ2–Y» +ë¬JäT¦9ö6·,¼SØ:¾ŒÞ[Çcú³f½Â³‹¢Å³«¢ƒ5+¡ÇK–…Ÿfãe!ëfÏe—B°K¯VÙ£ß9Z1ËìòKÏø¼9ó-&ÅB÷¨¨ÄÔ·ØÖmTžP¢Ê„× Ö‰¬Ìçf…?J)!¥n£%ŠÜ·‹,Ù¤eq{Rß¾Ú Ê€BsÑ1µ*¸Çµb”£p‰k‚r^nkð^6°Œ×e™©(]—ªÜ€hŠ\å#ÖV!Hzr+f!UF_'ÇSä(±:9b¹sCÎÈáäá¹ÊG¬¢˜÷äVÌB¾/…'ÉÉ¹ÊG¬Â¤OK'f!ÇœNN§È1d¨Ã³JÚ%¨³gáV?‡s³ýÜ†'÷A`¬KNgÏ@ŠÊoHÍhZãä>§aÔå¥³ç€&ø²’O@kœÜçtB•Ø´µç€F~E²”©ªýþL‹XÕ€ßÕàç²~L™‚½µJO“û˜Vp»dtöÌ\ÝÍ{Ìq©nßÓx>ßËr%Ÿ;pLîS:AQ—†Îž™2x(òÄIc`rŸÒ Œ»töÈ8Â‡"O1&÷)ˆT!Ü";{äHpr(òÄÙb`rŸÒ FºüsöÈÌ/¹¿†L÷Õ¹7õk¨—³±!E†SUó#a¼FU

premiso · August 11, 2009

Ok, lets re-arrange your code and put the call statements up top and remove the print_r

<?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


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

file_put_contents('txtfile.txt', pdf2txt('C:\Users\Mike\Desktop\Athy Register.pdf'));

if (file_exists('txtfile.txt')) {
    echo "File txtfile.txt has been created succesfully and contains <br><br><pre>";
    echo file_get_contents('txtfile.txt');
}else {
    echo "File txtfile.txt was not created due to an issue.";
}

function pdf2txt($filename){    

    $data = getFileData($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");
   
     $j = -1;
    foreach($a_obj as $obj){
       
        $a_filter = getDataArray($obj,"<<",">>");
   
        if ((is_array($a_filter)) && (count($a_filter) > 0)) {
            $j++;
            $a_chunks[$j]["filter"] = $a_filter[0];

            $a_data = getDataArray($obj,"stream\r\n","endstream");
            if ((is_array($a_data)) && (count($a_data) > 0)) {
                $a_chunks[$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 (isset($chunk['data'])) {
            // look at the filter to find out which encoding has been used           
            if (substr($chunk["filter"],"FlateDecode")!==false){
                $data =@ gzuncompress($chunk["data"]);
                if (trim($data)!=""){
                    $result_data .= ps2txt($data);
                } else {
               
                    //$result_data .= "x";
                }
            }
        }
    }
   
    if (isset($result_data)) {
    return $result_data;
} else {
    return false;
}
}

//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;
    $a_result = array();
   
    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;
}
?>

Give that a try and see what comes of it.

mikebyrne · August 11, 2009

I get the following

File txtfile.txt has been created succesfully and contains

(Can't find txtfile.txt on pc)

premiso · August 11, 2009

The text file will be created wherever that script was ran. You can define the path to place it on your desktop if that is easier for you like so:

rror_reporting(E_ALL);
ini_set('display_errors', TRUE);
$path = 'C:\Users\Mike\Desktop\';
file_put_contents($path . 'txtfile.txt', pdf2txt($path . 'Athy Register.pdf'));

if (file_exists($path . 'txtfile.txt')) {
    echo "File txtfile.txt has been created succesfully and contains <br><br><pre>";
    echo file_get_contents($path . 'txtfile.txt');
}else {
    echo "File txtfile.txt was not created due to an issue.";
}

Which will create it on the desktop for you. But the file exists, or else php would not say it did

mikebyrne · August 11, 2009

I'm getting the error

Parse error: parse error in C:\xampp\htdocs\pdf2txt_test.php on line 14

Line14 is

file_put_contents($path . 'txtfile.txt', pdf2txt($path . 'Athy Register.pdf'));

premiso · August 11, 2009

Sorry about that "\" is an escape character.

$path = 'C:\\Users\\Mike\Desktop\\';

Should get you straight.

mikebyrne · August 11, 2009

ahhhhhhhhhhhhhhhhhhhhhhhhhhhhh :facewall:

I'm now getting

Parse error: parse error in C:\xampp\htdocs\pdf2txt_test.php on line 67

Line 67 is

if (isset($chunk['data'])) {

premiso · August 11, 2009

Ok let's try this one more time.

error_reporting(E_ALL);
ini_set('display_errors', TRUE);
$path = 'C:\\Users\\Mike\\Desktop\\';
file_put_contents($path . 'txtfile.txt', pdf2txt($path . 'Athy Register.pdf'));

if (file_exists($path . 'txtfile.txt')) {
    echo "File txtfile.txt has been created succesfully and contains <br><br><pre>";
    echo file_get_contents($path . 'txtfile.txt');
}else {
    echo "File txtfile.txt was not created due to an issue.";
}

Replace that portion (the if statement was missing a ') and see if that corrects the issue.

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