jquery php implements the method of exporting datatables plug-in data to excel, jquerydatatables_PHP tutorial

function table2csv(oTable, exportmode, tableElm) { 
    var csv = ''; 
    var headers = []; 
    var rows = []; 
    // Get header names 
    $(tableElm+' thead').find('th').each(function() { 
      var $th = $(this); 
      var text = $th.text(); 
      var header = '"' + text + '"'; 
      // headers.push(header); // original code 
      if(text != "") headers.push(header); // actually datatables seems to copy my original headers so there ist an amount of TH cells which are empty 
    }); 
    csv += headers.join(',') + "\n"; 
    // get table data 
    if (exportmode == "full") { // total data 
      var total = oTable.fnSettings().fnRecordsTotal() 
      for(i = 0; i < total; i++) { 
        var row = oTable.fnGetData(i); 
        row = strip_tags(row); 
        rows.push(row); 
      } 
    } else { // visible rows only 
      $(tableElm+' tbody tr:visible').each(function(index) { 
        var row = oTable.fnGetData(this); 
        row = strip_tags(row); 
        rows.push(row); 
      }) 
    } 
    csv += rows.join("\n"); 
    // if a csv div is already open, delete it 
    if($('.csv-data').length) $('.csv-data').remove(); 
    // open a div with a download link 
    $('body').append('<div class="csv-data"><form enctype="multipart/form-data" method="post" action="/csv.php"><textarea class="form" name="csv">'+csv+'</textarea><input type="submit" class="submit" value="Download as file" /></form></div>'); 
} 
function strip_tags(html) { 
  var tmp = document.createElement("div"); 
  tmp.innerHTML = html; 
  return tmp.textContent||tmp.innerText; 
} 

// export only what is visible right now (filters & paginationapplied)
$('#export_visible').click(function(event) {  
   var oTable; 
   oTable= $('#spdata').dataTable(); 
   event.preventDefault(); 
   table2csv(oTable, 'visible', '#spdata'); })
   // export all table data 
$('#export_all').click(function(event) {  
  var oTable; 
  oTable= $('#spdata').dataTable(); 
  event.preventDefault(); 
 table2csv(oTable, 'full', '#spdata'); }) 

header("Content-Type: application/vnd.ms-execl");  
header("Content-Disposition: attachment; filename=myExcel.csv");  
header("Pragma: no-cache");  
header("Expires: 0");  
$buffer = $_POST['csv'];     
$buffer=str_replace(",",",\t",$buffer); 
$buffer=mb_convert_encoding($buffer,"GB2312","UTF-8");  
echo $buffer;