我面临的问题是代码生成Excel工作表所需的时间太长。因此，有时服务器会崩溃。在我的代码中，我正在运行两个循环。在Excel中也有80多个字段正在打印。请帮我离开这里，如何减少时间消耗？
这是我的代码
require("db_connect.php");
$con = db_connect();
if(isset($_REQUEST['project_id']))
$project_id =$_REQUEST['project_id'];
else
$project_id = '';
$file_name = $_GET['filename'];
//echo $file_name; exit;
error_reporting(E_ALL);
include 'Classes/PHPExcel.php';
include 'Classes/PHPExcel/IOFactory.php';
set_time_limit (0);
$cacheMethod = PHPExcel_CachedObjectStorageFactory:: cache_to_phpTemp;
$cacheSettings = array( 'memoryCacheSize' => '8MB');
PHPExcel_Settings::setCacheStorageMethod($cacheMethod, $cacheSettings);
$objPHPExcel = new PHPExcel();
$objPHPExcel->setActiveSheetIndex(0);
$sql = "select ";
$sql .="pm.start_date,pm.end_date,pm.tag_id,pdetails.circle_id,pm.project_name ";
$sql .=", ";
$sql .="pdetails.site_id_A,pdetails.site_name_A,pdetails.site_id_B,pdetails.site_name_B,pdetails.ref_id,pdetails.link_id,pdetails.site_type,pdetails.sow_id,pdetails.uom_id,pdetails.quantity,pdetails.rate,pdetails.amount,pdetails.allocation_date,pdetails.installation_date,pdetails.integration_date,pdetails.swapping_date,pdetails.at_date,pdetails.at_status,pdetails.payment_term_id,pdetails.first_mile_amt ,pdetails.second_mile_amt,pdetails.third_mile_amt,pdetails.done_by,pdetails.team_leader_name,pdetails.team_contact_no,pdetails.remarks,pdetails.id as lookupid,pdetails.project_id,pdetails.po_number,pdetails.po_shipment_number as shipment_no,pdetails.po_shipment_combined_no ";
//$sql .= ",pmile.po_number,pmile.po_shipment_number,pmile.po_shipment_combined_no ";
$sql .= "from project_details_master as pdetails ";
$sql .= "inner join project_milestone_master as pmile ";
$sql .= "on pdetails.id=pmile.lookup_id ";
$sql .= "inner join project_master as pm ";
$sql .= "on pm.id=pmile.project_id ";
if(!empty($project_id))
$sql .= " and pm.id in($project_id) ";
$sql .= "group by pdetails.id ";
//echo $sql;
//exit;
$results=mysqli_query($con,$sql);
$row = mysqli_fetch_assoc($results);
$row_count=mysqli_num_rows($results);
if($row_count == 0){
$file_path = "./excel_export/";
$csv_handler = fopen ($file_path.$file_name,'w');
fwrite ($csv_handler,'No record found');
fclose ($csv_handler);
//echo "No record found";
exit;
}
$arr_key = array_keys($row);
$c=1;
$sheet = $objPHPExcel->getActiveSheet();
$sheet->SetCellValue('A1', 'SL NO');
foreach ($arr_key as $kv) {
$sheet->setCellValueByColumnAndRow($c, 1, $kv);
$c++;
}
$mile_arr_heading = array('mile_stone','milestone_title','invoice_number','invoice_sent_date','invoice_status','tds_deduction','other_deduction_1','other_deduction_2','GST Amount','payment_status','clearance_date','payment_received');
$v2= $c;
for($i=1;$i<=3;$i++){
for($p=0;$p<count($mile_arr_heading);$p++) {
$kv2 = $mile_arr_heading[$p];
$sheet->setCellValueByColumnAndRow($v2,1, $kv2);
$v2++;
}
}
$results=mysqli_query($con,$sql);
$count = 0;
$rowcount = 2;
if($row_count>0){
while($row= mysqli_fetch_assoc($results)){
$col=1;
$count++;
$sheet->setCellValueByColumnAndRow(0,$rowcount,$count);
foreach($row as $key=>$value){
if($key=='at_status'){
if($value == 1)
$value = "Allocated";
if($value == 2)
$value = "Pending";
if($value == 3)
$value = "Work in Progress";
if($value == 4)
$value = "Completed";
}
$f_val = foreign_tble_val($key,$value);
if($f_val == '')
$sheet->setCellValueByColumnAndRow($col,$rowcount,$value);
else
$sheet->setCellValueByColumnAndRow($col,$rowcount,$f_val);
$pro = $row['project_id'];
$lkup = $row['lookupid'];
$arr_mile = array("m1","m2","m3");
$res = get_miestone_details($pro,$lkup);
if(count($res)>0){
$col2 = $col+1;
for($i=0;$i<count($arr_mile);$i++){
$mile_arr = $res[$arr_mile[$i]];
if(count($mile_arr)>0){
foreach($mile_arr as $key2=>$value2){
if($key2=='invoice_status') {
if($value2 == 2)
$value2 = "Pending";
if($value2 == 3)
$value2 = "Cleared";
}
if($key2=='payment_status') {
if($value2 == 1)
$value2 = "Pending";
if($value2 == 2)
$value2 = "Cleared";
}
$sheet->setCellValueByColumnAndRow($col2,$rowcount, $value2);
$col2++;
}
}else{
$col2 = $col2+11;
}
}
}
if( $row['done_by'] == 'Vendor' ){
$col3 = 70;
$sql3 = "select vendor_id ,vendor_sow_id,vendor_po_rate,po_number,invoice_number ";
$sql3 .="from project_vendor_details ";
$sql3 .="where project_id = '".$pro."' and
project_lookup_id = '".$lkup."' ";
//echo $sql3; exit;
$query3=mysqli_query($con,$sql3);
$v= $v2;
while($row3=mysqli_fetch_assoc($query3)){
foreach($row3 as $key3=>$value3){
$sheet->setCellValueByColumnAndRow($v,1, $key3);
$f_val = foreign_tble_val($key3,$value3);
if($f_val == '')
$sheet->setCellValueByColumnAndRow($col3,$rowcount, $value3);
else
$sheet->setCellValueByColumnAndRow($col3,$rowcount, $f_val);
$col3++;
$v++;
}
}
$v=0;
}
$col++;
}
$rowcount++;
$col=1;
}
//$sheet->getColumnDimension('E')->setVisible(false);
$sheet->getColumnDimension('AG')->setVisible(false);
$sheet->getColumnDimension('AH')->setVisible(false);
$sheet->setTitle('Simple');
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
$file_path = "./excel_export/";
$filename=$file_name;
$path = $file_path.$filename;
$objWriter->save($path);
exit;
}
function get_miestone_details($project_id,$lookup_id){
$arr_mile = array("m1","m2","m3");
$con = db_connect();
$sql2 = "select mile_stone,milestone_title,invoice_number,invoice_sent_date,invoice_status,tds_deduction,other_deduction_1,other_deduction_2,additional_payment_bonus,payment_status,clearance_date,payment_received ";
$sql2 .="from project_milestone_master ";
$sql2 .="where project_id = '".$project_id."' and lookup_id = '".$lookup_id."' and mile_stone in('m1','m2','m3') ";
//echo $sql2; exit;
$query2= mysqli_query($con,$sql2);
$num2 = mysqli_num_rows($query2);
//echo $num2; exit;
$res = array();
if($num2 > 0 ){
while($row2=mysqli_fetch_assoc($query2)){
$res[$row2['mile_stone']] = $row2;
}
}
for($i=0;$i<count($arr_mile);$i++){
if(!array_key_exists($arr_mile[$i],$res)){
$res[$arr_mile[$i]] = array();
}
}
return $res;
}