php csv show question marks

Question

I'm trying to export a CSV file, which is working all good when export. But there are some problems when I open my csv file, there are some text change to "??????". But in phpmyadmin there is all fine. The text is encoding by utf-8.

Here is my code

<?php
$day = $_POST['day'];

$starttime = "'".$day.' 00:00:00'."'";
$stoptime = "'".$day.' 23:59:59'."'";

$uname = "*********";
$pass = "*********";
$host = "*********"; 
$database = "*********"; 

$connection=mysql_connect($host,$uname,$pass); 

echo mysql_error();
$selectdb=mysql_select_db($database) or die("Database could not be selected");  
$result=mysql_select_db($database)or die("database cannot be selected <br>");

$output = "";
$table = "***********";
$sql = mysql_query("SELECT * FROM $table WHERE applytime BETWEEN $starttime AND $stoptime");
$columns_total  = mysql_num_fields($sql);
$rowcount = mysql_num_rows($sql);

if($rowcount >= 1)
{
for ($i = 0; $i < $columns_total; $i++) {
    $heading =  mysql_field_name($sql, $i);
    $output = '"'.$heading.'",';
}
$output .="\n";

while ($row = mysql_fetch_array($sql)) {
for ($i = 0; $i < $columns_total; $i++) {
$output .='"'.$row["$i"].'",';
}
$output .="\n";
}

$filename =  "myFile.csv";

header("content-type:application/csv;charset=UTF-8");
header('Content-Disposition: attachment; filename='.$filename);

echo $output;
exit;
}

else
{
    echo("There is no record Today");
}

?>

Please help thanks.

Answer 1

I don't see a call to the mysql_set_charset function.

mysql_set_charset('utf8');

Was that omission an oversight? Or was that purposefully omitted because its already been confirmed that the client characterset is set appropriately without that?

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Why are we writing code that uses the deprecated mysql_ functions, when both mysqli and PDO interfaces are available? And why are we writing code that is vulnerable to SQL Injection, by incorporating potentially unsafe values into SQL text?