Erreur SQL !
FROM posts WHERE (REPLACE (titre_post,"é","e") LIKE "%rechercher',"..),(),%" OR REPLACE (texte_post,"é","e") LIKE "%rechercher',"..),(),%") AND affiche_post="1" AND sujet_post="1" ORDER BY id_post DESC
FROM posts WHERE (REPLACE (titre_post,"é","e") LIKE "%rechercher',"..),(),%" OR REPLACE (texte_post,"é","e") LIKE "%rechercher',"..),(),%") AND affiche_post="1" AND sujet_post="1" ORDER BY id_post DESC