TCPDF ERROR Some data has already been output can t send PDF file

Question

I keep receiving this error when trying to add my own array into the code  Here is my array    array   array     while  odbc fetch row  rs      array     odbc result  rs  Product Name        test   print r  array     The original code is here  I m using an example page to try it because I know the example page works fine   http   www tcpdf org examples example 001 phps  This code is before the  html variable and when it is set I just add the  test variable into the  html variable  The odbc connection works fine and the example works fine before I add any code but when I run the script I get this error   Array    0    gt  Test1  1    gt  Test2   TCPDF ERROR  Some data has already been output  can t send PDF file   And there is also more than 2 items in the Array  Any ideas

User · Answer

Use ob start    at the beginning of your code

User · Answer

Add the function ob end clean   before call the Output function

User · Answer

The error of  Some data has already been output  can t send PDF file  refers to the output buffer of PHP   so you need to clean any content of the output buffer before sending output   ob end clean       Clean any content of the output buffer   then    pdf- gt Output  example 001 pdf    I       Send the PDF

User · Answer

I had this weird error and the culprit is a white space on the beginning of the PHP open tag   even without the ob flush and ob end clean  Just make sure there are no extra white spaces on or after any  lt  php   gt  block

User · Answer

This problem means you have headers  Deletes tags           at the end of your code and make sure not to have whitespace at the beginning

User · Answer

for my case Footer method was having malformed html code  missing td  causing error on osx   public function Footer      this- gt SetY -40    html    lt  lt  lt EOD  lt table gt   lt tr gt   Test Data  lt  tr gt   lt  table gt  EOD   this- gt writeHTML  html

User · Answer

I just want to add that I was getting this error  and nothing would fix it until I changed the Output destination parameter from F to FI  In other words  I have to output to both file and inline   Output  doc pdf    I     to  Output  doc pdf    FI     I have no idea why this made the difference  but it fixed the error for me

User · Answer

use  ob end clean      pdf- Output  file   I     to open pdf  It works for me

User · Answer

Just use  ob start    at the top of the page

User · Answer

This problem is when apache php show errors    This data html  destroy pdf output    You must off display errors in php ini

User · Answer

I had the same error but finally I solved it by suppressing PHP errors Just put this code error reporting 0   at the top of your print page         lt  php      error reporting 0     hide php errors     if    defined  BASEPATH    exit  No direct script access allowed        require once dirname   FILE        tohtml tcpdf tcpdf php              continue

User · Answer

For those who are still facing this issue try adding   libxml use internal errors true    before the loadHtml call and add   libxml use internal errors false    after the call    This solved it for me

User · Answer

The tcpdf file that causes the  data has already been output  is in the tcpdf folder called tcpdf php  You can modify it   add the line ob end clean    as below  3rd last line    public function Output  name  doc pdf    dest  I           LOTS OF CODE HERE          switch  dest            case  I                Send PDF to the standard output         if  ob get contents               this- gt Error  Some data has already been output  can  t send PDF file               some code here                  case  D                download PDF as file         if  ob get contents           this- gt Error  Some data has already been output  can  t send PDF file                 break           case  F           case  FI           case  FD                    save PDF to a local file                    LOTS OF CODE HERE            break           case  E                    return PDF as base64 mime email attachment          case  S                    returns PDF as a string             return  this- gt getBuffer                      default                 this- gt Error  Incorrect output destination     dest                              ob end clean      add this line here      return         Now lets look at your code  I see you have  rs and  sql mixed up  These are 2 different things working together     conn odbc connect  northwind                   if    conn       exit  Connection Failed       conn        sql  SELECT   FROM products     is products your table name   rs odbc exec  conn  sql   if    rs      exit  Error in SQL       while  odbc fetch row  rs        prodname odbc result  rs  Product Name      but preferably never use spaces for table names    prodid odbc result  rs  ProdID       prodID is assumed attribute   echo   prodname     echo   prodid     odbc close  conn    now you can use the  prodname and output it to the TCPDF output      and I assume your are connecting to a MS access database

User · Answer

I had this but unlike the OP I couldn t see any output before the TCPDF error message   Turns out there was a UTF8 BOM  byte-order-mark  at the very start of my script  before the  lt  php tag so before I had any chance to call ob start    And there was also a UTF8 BOM before the TCPDF error message

User · Answer

Add the function ob end clean    before call the Output function  It worked for me within a custom Wordpress function   ob end clean     pdf- gt Output  pdf name   I

[php] TCPDF ERROR: Some data has already been output, can't send PDF file

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