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<?php $res = NULL; $res1 = NULL; print_r(gettype($res1)); //print_r(gettype($res) && !is_null($res1)); if(!is_null($res) && !is_null($res1)){ echo' не равен null'; } elseif(is_null($res) && is_null($res1)){ echo' оба равны null'; } elseif(!is_null($res) && is_null($res1)){ echo' res не равен null a res1 равен null'; } elseif(is_null($res) && !is_null($res1)){ echo' res равен null a res1 не равен null'; }
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