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I've found this afternoon a solution. It's a question of "structure". For my explication, i have simplified the code.
Before, i made that:
le="color: #000000"><?php for ($i=0; $i<$nbvar,$i++) { $_SESSION["var['contact'][$i]"]=$value1[$i]; $_SESSION["var['adresse'][$i]"]=$value2[$i]; } //and for desrtroy unset($_SESSION["var['contact']"]); unset($_SESSION["var['adresse']"]); // but that doesn't work
But now i do that:
le="color: #000000"><?php for ($i=0; $i<$nbvar,$i++) { $var["$i"]['contact']=$value1[$i]; $var["$i"]['adresse']=$value2[$i]; } $_SESSION['var']=$var; //and for desrtroy unset($_SESSION["var"]); // and that work :-D