XML : XML : How can read from multi path by php

I have an XML file like :

  <competition competition_id="9">  <season season_id="11643">  <round round_id="31545" name="Regular Season">  <match match_id="2054191" team_A_name="Bayern München" team_B_name="Hamburger SV" />  <match match_id="2054193" team_A_name="Bayer Leverkusen" team_B_name="Hoffenheim" />  </round>  </season>  </competition>    

No i try to save from this file into my Data Base like :

  $xml = simpleXML_load_file($url,"SimpleXMLElement",LIBXML_NOCDATA);   $competitions = $xml->xpath('//competition');  $seasons = $xml->xpath('//season');  $rounds = $xml->xpath('//round');  $matchs = $xml->xpath('//match');    foreach ($competitions as $competition) {      foreach ($seasons as $season) {        foreach ($rounds as $round) {          foreach ($matchs as $match) {            $competition_id = $competition->attributes()->competition_id;          $season_id = $competition->season->attributes()->season_id;          $round_id = $competition->season->round->attributes()->round_id;          $match_id = $competition->season->round->match->attributes()->match_id;            $matches_insert = mysql_query("INSERT INTO `matches` (`competition_id` ,`season_id` ,`round_id` ,`match_id` ,`team_A_name`,`team_B_name`) VALUES ('$competition_id',  '$season_id',  '$round_id',  '$match_id', '$team_A_name',   '$team_B_name');");        }      }    }  }    

This code is save only first record, and duplicate it two time.

How can save this tow records without duplicate?