Get csv from table mysql use php

exportCSV.php

<?php

$dbHost = 'localhost';
$dbUser = 'root';
$dbPass = '';
$dbName = 'blog'; //database name
$table= 'users'; //table name you need export
$fileName = 'export';

//try connect
$dbLink = mysql_connect($dbHost, $dbUser, $dbPass) or die('Can not connect.' . mysql_error());
mysql_select_db($dbName) or die('Can not connect.');

$csvFileContent = '';
//first row is header name column
$columns = mysql_query('SHOW COLUMNS FROM ' . $table);
$i = 0;
if (mysql_num_rows($columns) > 0) {
    while ($row = mysql_fetch_assoc($columns)) {
        $csvFileContent .= $row['Field'] . ',';
        $i++;
    }
}

//rows content data of table
$csvFileContent .= "\n";
$values = mysql_query('SELECT * FROM ' . $table);
while ($rows = mysql_fetch_row($values)) {
    for ($j = 0; $j < $i; $j++) {
        $csvFileContent .= $rows[$j] . ', ';
    }
    $csvFileContent .= "\n";
}

//file export name format: fileName_timeStamp
$time = new \DateTime();
$fileName = $fileName . '_' . $time->getTimestamp();

//response file csv
header('Content-type: application/vnd.ms-excel');
header('Content-disposition: filename=' . $fileName . '.csv');
print $csvFileContent;
exit;