PHP Export CSV file

Reprint: http://blog.csdn.net/huyanping/article/details/7068356

Often encounter need to export data from the database to Excel file, with some open-source class library, such as Phpexcel, it is quite easy to implement, but the support of a lot of data is not good, it is easy to reach the PHP memory usage limit. The method here is to use the Fputcsv write CSV file method, directly to the browser output Excel file.
　　
Output Excel file header, you can replace user.csv with the file name you want
Header (' Content-type:application/vnd.ms-excel ');
Header (' content-disposition:attachment;filename= ' user.csv "');
Header (' cache-control:max-age=0 ');
Get the data from the database, in order to save memory, do not read the data once to the memory, the subordinate handle in a row to read
$sql = ' SELECT * from tbl where ... ';
$stmt = $db->query ($sql);
Open PHP file handle, php://output direct output to browser
$fp = fopen (' php://output ', ' a ');
Output Excel Column name information
$head = Array (' name ', ' gender ', ' age ', ' Email ', ' phone ', ' ... ');
foreach ($head as $i = = $v) {
CSV Excel support GBK encoding, be sure to convert otherwise garbled
$head [$i] = iconv (' utf-8 ', ' GBK ', $v);
}
Writes data to a file handle via Fputcsv
Fputcsv ($fp, $head);
Counter
$cnt = 0;
Every $limit line, refresh the output buffer, not too big, not too small
$limit = 100000;
Row-by-line data extraction without wasting memory
while ($row = $stmt->fetch (zend_db::fetch_num)) {
$cnt + +;
if ($limit = = $cnt) {//Refresh output buffer to prevent problems caused by excessive data
Ob_flush ();
Flush ();
$cnt = 0;
}
foreach ($row as $i = = $v) {
$row [$i] = iconv (' utf-8 ', ' GBK ', $v);
}
Fputcsv ($fp, $row);
}

The above describes the PHP export CSV file, including the aspects of the content, I hope the PHP tutorial interested in a friend helpful.

