Convert a mysql for loop to mysqli for loop - php

Question

I found a piece of code on the internet that does exactly what I was looking for. The code is about downloading the mysql data into excel sheet format using PHP mysql.
The problem is that I need to convert mysql to mysqli functions and it doesn't seems to work. The for loop needs to be completely changed. Any suggestions?
$conn = mysqli_connect("localhost","root","","dvarsam2"); //server,username,password,db
mysqli_query($conn,'SET NAMES utf8');
$setCounter = 0;
$setExcelName = "download_excal_file";
$setSql = "SELECT * FROM wp_applications";
$setRec = mysqli_query($conn,$setSql);
$setCounter = mysql_num_fields($setRec);
for ($i = 0; $i < $setCounter; $i++) {
$setMainHeader .= mysql_field_name($setRec, $i)."\t";
}
while($rec = mysql_fetch_row($setRec)) {
$rowLine = '';
foreach($rec as $value) {
if(!isset($value) || $value == "") {
$value = "\t";
} else {
//It escape all the special charactor, quotes from the data.
$value = strip_tags(str_replace('"', '""', $value));
$value = '"' . $value . '"' . "\t";
}
$rowLine .= $value;
}
$setData .= trim($rowLine)."\n";
}
$setData = str_replace("\r", "", $setData);
if ($setData == "") {
$setData = "\nno matching records found\n";
}
$setCounter = mysql_num_fields($setRec);
//This Header is used to make data download instead of display the data
header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=".$setExcelName."_Reoprt.xls");
header("Pragma: no-cache");
header("Expires: 0");
//It will print all the Table row as Excel file row with selected column name as header.
echo ucwords($setMainHeader)."\n".$setData."\n";

Answer 1

For MySQLi:
<?php
$conn = mysqli_connect("localhost","root","","dvarsam2"); //server,username,password,db
mysqli_query($conn,'SET NAMES utf8');
$setExcelName = "download_excal_file";
//This Header is used to make data download instead of display the data
header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=".$setExcelName."_Reoprt.xls");
header("Pragma: no-cache");
header("Expires: 0");
$result = mysqli_query( $conn, "SELECT * FROM wp_applications" );
$i = 0;
while( $row = $result->fetch_assoc() )
{
if( $i == 0 )
{
// Print field names
foreach( $row as $key => $value )
{
echo $key."\t";
}
echo "\n";
}
// Print data
foreach( $row as $key => $value )
{
$value = strip_tags(str_replace('"', '""', trim($value)));
echo '"' . str_replace("\r", "", $value ) . '"' . "\t";
}
echo "\n";
$i++;
}
if( $result->num_rows == 0 ) echo "no matching records found\n";

Answer 2

You can also just fix your SELECT statement to format output in Excel format:
SELECT * FROM mytable
INTO OUTFILE '/mytable.csv'
FIELDS ESCAPED BY '""'
TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\r\n';
See here for more. The code you supplied is from the accepted answer, but I prefer this solution.