Laravel MySQL：将SQL查询转换为Laravel Eloquent

I am trying to get time availability for my scheduling system. I know how to do it with plain SQL query but I am having trouble translating the query to Laravel Eloquent. My query is like the one below

$query =  "SELECT * FROM schedules WHERE (time_start BETWEEN '$start_datetime' AND '$end_datetime') OR (time_endBETWEEN '$start_datetime' AND '$end_datetime')";

and here's what I have tried with laravel eloquent so far

$sch = DB::table('schedules')
                ->where(function ($query) {
                    $query->whereBetween('time_start', [$start_datetime, $end_datetime]);
                })
                ->orWhere(function($query){
                    $query->whereBetween('time_end', [$start_datetime, $end_datetime]);
                })->get();

any ideas how to do it right? I am getting an error with my laravel eloquent query Undefined variable: start_datetime

Thanks

You need to call the variables to closure scope by using use

$sch = DB::table('schedules')
                ->where(function ($query) use ( $start_datetime,$end_datetime) {
                    $query->whereBetween('time_start', [$start_datetime, $end_datetime]);
                })
                ->orWhere(function($query) use ( $start_datetime,$end_datetime){
                    $query->whereBetween('time_end', [$start_datetime, $end_datetime]);
                })->get();