PHP使用外部命令导出数据库，代码很简单，就不多废话了

// $dumpFileName目录要有可写权限

$DbHost = 'localhost';

$DbUser = 'root';

$DbPwd = '123456';

$DbName = 'a';

$fileName = $DbName . '_MySQL_data_backup_' . date('YmdHis) . '.sql';

$dumpFileName= "/var/$fileName";

header("Content-Disposition: attachment; filename=" . $fileName);

header("Content-type: application/octet-stream");

header("Pragma:no-cache");

header("Expires:0");

echo `mysqldump -h $DbHost -u$DbUser -p$DbPwd $DbName > $dumpFileName`;

$hd = fopen($dumpFileName, 'rb');

echo fread($hd, filesize($dumpFileName));

fclose($hd);

?>

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