php计算整个mysql数据库大小的方法

function CalcFullDatabaseSize($database, $db) {
  $tables = mysql_list_tables($database, $db);
  if (!$tables) { return -1; }
  $table_count = mysql_num_rows($tables);
  $size = 0;
  for ($i=0; $i < $table_count; $i++) {
    $tname = mysql_tablename($tables, $i);
    $r = mysql_query("SHOW TABLE STATUS FROM ".$database." LIKE ".$tname."");
    $data = mysql_fetch_array($r);
    $size += ($data[Index_length] + $data[Data_length]);
  };
  $units = array( B,  KB,  MB,  GB,  TB);
  for ($i = 0; $size > 1024; $i++) { $size /= 1024; }
  return round($size, 2).$units[$i];
}
/*
** Example:
*/
// open mysql connection:
$handle = mysql_connect(localhost, user, password); 
if (!$handle) { die(Connection failed!); }
// get the size of all tables in this database:
print CalcFullDatabaseSize(customer1234, $handle);
// --> returns something like: 484.2 KB
// close connection:
mysql_close($handle);