Unable to save dataType Timestamp to PostgreSQL

i am trying to insert data to my PostgreSQL table, i am getting date as string from form, but i end up with this error

ERROR: malformed array literal: "" LINE 2: ...d','2018-07-27 00:00:00','2018-07-27 00:00:00','','',1,1,'',... ^ DETAIL: Array value must start with "{" or dimension information.

this is my query

insert into events (title,location,description,start_date,end_date,start_time,end_time,is_pet,is_child,untill,repeat) values ('test','asdasd','asdasd',2018-07-27 00:00:00,2018-07-27 00:00:00,'','',1,1,'','Does Not Repeat')

and my query is parsed like this

$query = "insert into events (title,location,description,start_date,end_date,start_time,end_time,is_pet,is_child,untill,repeat) values 
          ('$title','$location','$description',$start_date,$end_date,'$start_time','$end_time',$is_pet,$is_child,'$until','$repeat')";

$sql = pg_query($query);
if (!$sql) {
    echo pg_last_error($db);
} else {
    echo "Records created successfully\n";
}

My Schema as follows

CREATE TABLE public.events (
    id integer NOT NULL,
    title character varying(255),
    location character varying(255),
    description character varying(255),
    end_date timestamp without time zone,
    start_time character varying(20),
    end_time character varying(20)[],
    image character varying(500),
    is_pet boolean,
    is_child boolean,
    repeat character varying,
    created_at timestamp without time zone,
    updated_at timestamp without time zone,
    posted_by character varying(255),
    email character varying(255),
    untill date,
    start_date timestamp without time zone
);