Function array_remove

src/backend/utils/adt/arrayfuncs.c:6517–6534

* Remove any occurrences of an element from an array * * If used on a multi-dimensional array this will raise an error. */

 * If used on a multi-dimensional array this will raise an error.
 */
Datum
array_remove(PG_FUNCTION_ARGS)
{
	ArrayType  *array;
	Datum		search = PG_GETARG_DATUM(1);
	bool		search_isnull = PG_ARGISNULL(1);

	if (PG_ARGISNULL(0))
		PG_RETURN_NULL();
	array = PG_GETARG_ARRAYTYPE_P(0);

	array = array_replace_internal(array,
								   search, search_isnull,
								   (Datum) 0, true,
								   true, PG_GET_COLLATION(),
								   fcinfo);
	PG_RETURN_ARRAYTYPE_P(array);
}

/*
 * Replace any occurrences of an element in an array