Zipjo

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<?

$chaine = 'a b c';

$chaine = str_replace('a','<img src="images\lettres\a.gif">',$chaine);

$chaine = str_replace('b','<img src="images\lettres\b.gif">',$chaine);

$chaine = str_replace('c','<img src="images\lettres\c.gif">',$chaine);

print $chaine;

?>