Eloquent - Get records by day - php

Question

I have a list of database records that represent some events. Each has a start_time column that contains dates in this format: 2017-10-28 22:00:00. I would like to be able to get all the records whose column start_time is a Friday using Laravel. Something like this:
$fridayEvents = $q->whereDate('start_time', '=', isFriday());
But I am having a hard time creating isFriday() with Carbon.

Answer 1

MySQL (and other SQLs) implement the WEEKDAY() function that extracts the weekday from a date:
WEEKDAY(date)
Returns the weekday index for date (0 = Monday, 1 = Tuesday, … 6 =
Sunday).
mysql> SELECT WEEKDAY('2008-02-03 22:23:00');
-> 6
mysql> SELECT WEEKDAY('2007-11-06');
-> 1
So you can do a query like this:
$q->whereRaw('WEEKDAY(your_table_name.start_date) = 4')
This way is more efficient then filtering results directly on PHP using Carbon:
You will process data using native database functions that are faster then Carbon over PHP.
Only the relevant data will travel from Database to PHP, reducing query time and memory usage
To get the top performance, you'll need to create a column to store the weekday, so your database will be able to use indexes to avoid full-table scan, giving you the best performance.

Answer 2

whereDate() will only check the dates, so you can't check day with whereDate()
For achieving your goal, you need to perform couple of operations, I am using psuedocode as I don't know how you are querying.
$records = Event::get();
$filteredArray = array();
foreach($records as $record){
if(Carbon::parse($record->start_time)->dayOfWeek == Carbon::FRIDAY || Carbon::parse($record->start_time)->dayOfWeek == Carbon::SATURDAY){
$fillteredArray[]= $record;
}
}
I hope it helps :)

Answer 3

Assuming the model's $casts property is properly casting the column to a date, one can easily apply the filter method using Carbon's dayOfWeek property.
/** #var \Illuminate\Support\Collection $events */
$fridays = $events->filter(
fn ($v, $k) => $v->start_time->dayOfWeek === Carbon::FRIDAY
);
Now $fridays will only contain those events that started on a Friday. Note the database method detailed in the other answer remains more efficient in cases where you have the option to use it, but this may be helpful when extracting a subset from an existing collection.

Answer 4

use Carbon\Carbon;
// this will return an array of events
$fridayEvents = $q->start_time;
// assign empty array variable
$dates = [];
//loop on the events
foreach($fridayEvents as $event){
// Use carbon to parse make sure it is a date not a string type then reformat it by using format() and the small 'l' inside the format returns the exact name for the day of that date
// so if it is friday go and push into the array the entire event
if(Carbon::parse($event)->format('l') == 'Friday'){
array_push($dates, $event);
}
}
// die and dump the data after pushing into the $dates the events
dd($dates);