<?php function getDialogKey($message) { $ids = array_flip([$message['id_profile_from'], $message['id_profile_to']]); ksort($ids, SORT_NUMERIC); return implode('_', array_flip($ids)); } var_dump(getDialogKey([ 'id_profile_from' => 1905, 'id_profile_to' => 1683, ]));
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