Copia de una BD

[Panino5001]

Código:

<?php
$db_host = "localhost";
$db_name = "db";
$db_user = "user";
$db_pass = "pass";
mysql_connect($db_host,$db_user,$db_pass);
mysql_select_db($db_name) or die("Unable to select database.");
function datadump ($table) {
    $result .= "# Dump of ".$table." \n";
    $result .= "# Dump DATE : " . date("d-M-Y") ."\n\n";
    $query = mysql_query("select * from ".$table);
    $num_fields = @mysql_num_fields($query);
    $numrow = mysql_num_rows($query);
    while($row=mysql_fetch_array($query)) {
  $result .= "INSERT INTO ".$table." VALUES(";
    for($j=0; $j<$num_fields; $j++) {
    $row[$j] = addslashes($row[$j]);
    $row[$j] = ereg_replace("\n","\\n",$row[$j]);
    if (isset($row[$j])) $result .= "\"$row[$j]\"" ; else $result .= "\"\"";
    if ($j<($num_fields-1)) $result .= ",";
   }    
      $result .= ");\n";
     }
     return $result . "\n\n\n";
  }
 $qry2=mysql_list_tables($db_name);
 $tot_tablas=mysql_num_rows($qry2);
 for($i=0;$i<$tot_tablas;$i++){
 $nombre_tabla=mysql_tablename($qry2,$i);
 $content.=datadump($nombre_tabla);
 } 
$file_name = "MySQL_Database_Backup.sql";
header( "Content-Type: application/octet-stream"); 
header( "Content-Disposition: attachment; filename=".$file_name.""); 
echo $content; 
?>