Convert PHP arrays to XLS

Class file

<?php
/*
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/*
  
	Filename	: export.xls.class.php
	Description	: A small light weight PHP class to allow the creation of simple xls excel spreadsheets from array data.
	Version 	: 1.01
	Author 		: Leenix
	Website		: http://www.leenix.co.uk
*/

/*
	Change Log
		V1 - First Release
 		1.01 - Fixed UTF8 Issue
 */

class ExportXLS {

	private $filename;	//Filename which the excel file will be returned as
	private $headerArray;	// Array which contains header information
	private $bodyArray;	// Array with the spreadsheet body
	private $rowNo = 0;	// Keep track of the row numbers


	#Class constructor
	function ExportXLS($filename) { 
		$this->filename = $filename;
	}


	/*
	-------------------------
	START OF PUBLIC FUNCTIONS
	-------------------------
	*/

	public function addHeader($header) {
	#Accepts an array or var which gets added to the top of the spreadsheet as a header.

		if(is_array($header)) {
			$this->headerArray[] = $header;
		}
		else
		{
			$this->headerArray[][0] = $header;
		}
	}

	public function addRow($row) {
	#Accepts an array or var which gets added to the spreadsheet body

		if(is_array($row)) {
			#check for multi dim array
			if(is_array($row[0])) {
				foreach($row as $key=>$array) {
					$this->bodyArray[] = $array;
				}
			}
			else
			{
				$this->bodyArray[] = $row;
			}			
		}
		else
		{
			$this->bodyArray[][0] = $row;
		}
	
	}
	
	public function returnSheet() {
	# returns the spreadsheet as a variable

		#build the xls
		return $this->buildXLS();
	}

	public function sendFile() {

		#build the xls
		$xls = $this->buildXLS();

		#send headers
		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/download");
		header("Content-Disposition: attachment;filename=".$this->filename);
		header("Content-Transfer-Encoding: binary ");

		echo $xls;

		exit;
	}


	/*
	--------------------------
	START OF PRIVATE FUNCTIONS
	--------------------------
	*/

	private function buildXLS() {
	# build and return the xls 
	
		#Excel BOF
		$xls = pack("ssssss", 0x809, 0x8, 0x0, 0x10, 0x0, 0x0);

		#build headers
		if(is_array($this->headerArray)) {
			$xls .= $this->build($this->headerArray);
		}

		#build body
		if(is_array($this->bodyArray)) {
			$xls .= $this->build($this->bodyArray);
		}

		$xls .= pack("ss", 0x0A, 0x00);

		return $xls;
	}

	private function build($array) {
	#build and return the headers 

		foreach($array as $key=>$row) {
			$colNo = 0;
			foreach($row as $key2=>$field) {
				if(is_numeric($field)) {
					$build .= $this->numFormat($this->rowNo, $colNo, $field);
				}
				else
				{
					$build .= $this->textFormat($this->rowNo, $colNo, $field);
				}

				$colNo++;
			}
			$this->rowNo++;
		}

		return $build;
	}

	private function textFormat($row, $col, $data) {
	# format and return the field as a header
		$data = utf8_decode($data);
		$length = strlen($data);
		$field = pack("ssssss", 0x204, 8 + $length, $row, $col, 0x0, $length);
		$field .= $data;

		return $field; 
	}
		

	private function numFormat($row, $col, $data) {
	# format and return the field as a header
    		$field = pack("sssss", 0x203, 14, $row, $col, 0x0);
    		$field .= pack("d", $data); 
		
		return $field; 
	}
}
?>

Demo file

<?php
/*

A quick script to demo the use of the export-xls.class.php script.

*/


#include the export-xls.class.php file
require('export-xls.class.php');


$filename = 'test.xls'; // The file name you want any resulting file to be called.

#create an instance of the class
$xls = new ExportXLS($filename);


#lets set some headers for top of the spreadsheet
#

$header = "Test Spreadsheet"; // single first col text
$xls->addHeader($header);

#add blank line
$header = null;
$xls->addHeader($header);

#add 2nd header as an array of 3 columns
$header[] = "Name";
$header[] = "Age";
$header[] = "Height";

$xls->addHeader($header);


# Lets add some sample data
#
# Of course this can be from a SQL query or anyother data source
#

#first line
$row[] = "Jack";
$row[] = "24";
$row[] = "6ft 5";
$xls->addRow($row);

#second line
$row = array();
$row[] = "Jim";
$row[] = "22";
$row[] = "5ft 5";
$xls->addRow($row);

#add a multi dimension array
$row = array();
$row[] = array(0 =>'Jess', 1=>'54', 2=>'4ft');
$row[] = array(0 =>'Luke', 1=>'6', 2=>'2ft');
$xls->addRow($row);


# You can return the xls as a variable to use with;
# $sheet = $xls->returnSheet();
#
# OR
#
# You can send the sheet directly to the browser as a file 
#
$xls->sendFile();


?>

Hello, I didn't fully understand at first where to put the $build = ''; @vesaka talked about.
So to make it clearer to beginers, you should had $build = ''; under this line :
private function build($array) {
for me it was located at line 143.
Hope it helps !