SELECT t1.nom as nom1, scoreTeam1, scoreTeam2,t2.nom as nom2 FROM MATCHS 
LEFT JOIN EQUIPE AS t1 ON MATCHS.equipe1=t1.id 
LEFT JOIN EQUIPE AS t2 ON MATCHS.equipe2=t2.id

SELECT CONCAT(IFNULL(t2.nom, ''),' ', IFNULL(scoreTeam1, ''), ' - ', IFNULL(scoreTeam2, ''), ' ', IFNULL(t3.nom, ''))
FROM MATCHS 
LEFT JOIN EQUIPE AS t2 ON MATCHS.equipe1=t2.id 
LEFT JOIN EQUIPE AS t3 ON MATCHS.equipe2=t3.id

SELECT CONCAT(t2.nom,' ', scoreTeam1, ' - ',scoreTeam2, ' ',t3.nom)
FROM MATCHS LEFT JOIN EQUIPE AS t2 ON MATCHS.equipe1=t2.id LEFT JOIN EQUIPE AS t3 ON MATCHS.equipe2=t3.id

$query = "SELECT * 
FROM `MATCH`
LEFT JOIN `EQUIPE`
ON `MATCH`.`equipe1` = `EQUIPE`.`id_EQUIPE` ...
";