php使用指定编码导出mysql数据到csv文件的方法

<?php
/*
 * PHP code to export MySQL data to CSV
 * 
 * Sends the result of a MySQL query as a CSV file for download
 * Easy to convert to UTF-8.
 */

 /*
 * establish database connection
 */

$conn = mysql_connect('localhost', 'login', 'pass') or die(mysql_error());
mysql_select_db('database_name', $conn) or die(mysql_error($conn));
mysql_query("SET NAMES CP1252");
/* 
 * execute sql query   
 */
$query = sprintf('SELECT field1,field2 FROM table_name');
$result = mysql_query($query, $conn) or die(mysql_error($conn));
/* 
 * send response headers to the browser
 * following headers instruct the browser to treat the data as a csv file called export.csv
 */
header('Content-Type: text/csv; charset=cp1252');
header('Content-Disposition: attachment;filename=output.csv');
/* 
 * output header row (if atleast one row exists) 
 */ 
  
$row = mysql_fetch_assoc($result); 
if ($row) {
  echocsv(array_keys($row));
}

/*
 * output data rows (if atleast one row exists)
 */
while ($row) {
  echocsv($row);
  $row = mysql_fetch_assoc($result);
}

/*
 * echo the input array as csv data maintaining consistency with most CSV implementations
 * - uses double-quotes as enclosure when necessary
 * - uses double double-quotes to escape double-quotes
 * - uses CRLF as a line separator
 */

function echocsv($fields)
{
  $separator = '';
  foreach ($fields as $field) {
    if (preg_match('/\\r|\\n|,|"/', $field)) {
 $field = '"' . str_replace('"', '""', $field) . '"';
    }
    echo $separator . $field;
    $separator = ',';
  }
  echo "\r\n";
}
?>