Export to ExCel shows some columns empty - php

Question

I am trying to export the data from PHP & MySql. I am getting Empty value for Fields which are having huge data(around 1000 chars). Except those fields everything is working fine.
This is the code which i am using right now. Please check once and let me know if any modifications. I searched in google, so many said its cache/memory problem.
<?php
function xlsBOF() {
echo pack("ssssss", 0x809, 0x8, 0x0, 0x10, 0x0, 0x0);
return;
}
function xlsEOF() {
echo pack("ss", 0x0A, 0x00);
return;
}
function xlsWriteNumber($Row, $Col, $Value) {
echo pack("sssss", 0x203, 14, $Row, $Col, 0x0);
echo pack("d", $Value);
return;
}
function xlsWriteLabel($Row, $Col, $Value ) {
$L = strlen($Value);
echo pack("ssssss", 0x204, 8 + $L, $Row, $Col, 0x0, $L);
echo $Value;
return;
}
$sel_sql=mysql_query("select desc from table");
$myFile = date("m-d-Y").'_users.xls';
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Content-Type: application/force-download");
header("Content-Type: application/octet-stream");
header("Content-type: application/vnd.ms-excel");
header("Content-Type: application/download");;
header("Content-Disposition: attachment;filename=".$myFile);
header("Content-Transfer-Encoding: binary ");
// XLS Data Cell
xlsBOF();
xlsWriteLabel(0,1,"desc");
$xlsRow = 1;
while(list($desc)=mysql_fetch_row($sel_sql)) {
xlsWriteLabel($xlsRow,1,"$desc");
$xlsRow++;
}
xlsEOF();
?>

Answer 1

Assuming you're using an xls file output: in a BIFF format file, a cell is limited to 32,767 characters; but only 1,024 characters are displayed in the cell. All 32,767 characters are display in the formula bar.
EDIT
Reading the code that you've actually posted:
Excel has limits on the amount of data a cell can hold: for Excel BIFF 8 files, that limit is 32,767 characters. However, for long strings, this data is maintained in the BIFF file across several blocks with continuation records, For BIFF 5 files (Excel 95) the limit is 2084 bytes per block; in BIFF 8 files (Excel 97 and above) the limit is 8228 bytes. Records that are longer than these limits must be split up into CONTINUE blocks.
This relatively simplistic writer isn't written to handle splitting the record into multiple continuation records: it doesn't even use the BIFF 8 shared string table, or indicate what BIFF version it is writing (which means Excel will open it using lowest common denominator parameters). It simply tries to store the entire contents of the cell into a standard label block. To fix this, you'd need to fix your code to handle splitting the string values with continuation blocks (via a shared string table); or switch to using a library that does handle splitting the shared strings across multiple blocks already.