geral xls varias sheets

é possivel adaptar este codigo para extrair dados de 5 tabelas da mesma bdados e geral um xls com 5 sheets?

<?php require_once('Connections/db.php'); ?>
<?php

$query_Recordset1 = sprintf("SELECT * from tabela);

$export = mysql_query ( $query_Recordset1 ) or die ( "Sql error : " . mysql_error( ) );

$fields = mysql_num_fields ( $export );
$header = '';
for ( $i = 0; $i < $fields; $i++ )

{

 $header .= mysql_field_name( $export , $i ) . "\t";
}
$data = '';

while( $row = mysql_fetch_row( $export ) ) {

 $line = '';
 foreach( $row as $value )
 {
 if ( ( !isset( $value ) ) || ( $value == "" ) )
 {
 $value = "\t";
 }
 else
 {
 $value = str_replace( '"' , '""' , $value );
 $value = '"' . $value . '"' . "\t";
 }
 $line .= $value;
 }
$data .= trim( $line ) . "\n";
}
$data = str_replace( "\r" , "" , $data );

if ( $data == "" )

{

 $data = "\n(0) Records Found!\n";
}

header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=ficheiro.xls");
header("Pragma: no-cache");
header("Expires: 0");
print "$header\n$data";

mysql_free_result($Recordset1);
?>