I'm trying to increment during the map method, however my variable doesn't seem to save the new value. My code:
$position = 0;
$statement = $medias->map(fn(string $media) => [
'position' => ++$position
])->values();
My expected result would be:
#items: array:4 [
0 => array:4 [
"position" => 1
]
1 => array:4 [
"position" => 2
]
2 => array:4 [
"position" => 3
]
3 => array:4 [
"position" => 4
]
]
However it's actually
#items: array:4 [
0 => array:4 [
"position" => 1
]
1 => array:4 [
"position" => 1
]
2 => array:4 [
"position" => 1
]
3 => array:4 [
"position" => 1
]
]
Is incrementing inside map not possible or am I doing something wrong here?
The problem here is that you expect $position variable to be passed by reference, which is not the case.
Arrow functions use by-value variable binding. This is roughly equivalent to performing a use($x) for every variable $x used inside the arrow function. A by-value binding means that it is not possible to modify any values from the outer scope. Anonymous functions can be used instead for by-ref bindings. PHP Manual - Arrow Functions
A workaround for you could be like this:
// Either
$posObj = new \stdClass();
$posObj->position = 0;
// or
$posObj = (object)array('position' => 0);
$statement = $medias->map(fn(string $media) => [
'position' => ++$posObj->position
])->values();
Related
I have he next array looks like:
array:50 [▼
0 => array:39 [▶]
1 => array:39 [▶]
2 => array:39 [▶]
]
So I want to get arrays with a value in common, for example:
array:39 [▼
"id" => 121
"user" => 368
]
array:39 [▼
"id" => 121
"user" => 3687
]
array:39 [▼
"id" => 500
"user" => 452
]
I want to get the two arrays with the attribute
id 121, I was trying to looping the array with foreach looks like:
foreach ($info as $val){
foreach($info as $f ){
if($f["id"]==$val["id"]){
//get the multiple arrays
}
}
}
So, I can't get all the arrays, some idea to how can do that?
I'd use a Collection.
collect your array of arrays:
$collection = collect([
[
"id" => 121
"user" => 368
],
[
"id" => 121
"user" => 3687
],
[
"id" => 500
"user" => 452
]
]);
Use the where method to filter based on a specific key's value:
$filtered = $collection->where('id', 121);
$filtered->all();
/*
[
['id' => '121', 'user' => 368],
['id' => '121', 'user' => 3687],
]
*/
Other where-like methods are available. Be sure to read through all of the documentation on Collections, it's full of great examples!
If you're now convinced that you should use Collections for everything, check out Adam Wathan's awesome book (and other resources): Refactoring to Collections (not free)
I have pivot table vacancy_tag. I tried different options (value,select, lists and etc), but didn't go further than that. My request:
Vacancy::where('id',1)->with(['tags' => function ($q){
$q->select('tags.id')->pluck('id');
}])->get()->toArray();
return this:
"id" => 1,
"title" => "pm",
"tags" => array:2 [▼
0 => array:1 [▼
"id" => 1
]
1 => array:1 [▼
"id" => 2
]
but need this:
"id" => 1,
"title" => "pm",
"tags" => [
1,
2
]
I would like to receive the data result in a query, without using a methods transformation of the collection, if possible.
PS: I slightly corrected the example, need to display all fields of the vacancy + an array of tags.
In input I have such an array:
array:1 [
"prizes" => array:1 [
1 => array:2 [
"prize_id" => "1"
"priority" => "1"
"some_fields" => "some_value"
]
]
]
In controller, I try to get only two fields:
$request->only([
'prizes.*.priority',
'prizes.*.prize_id'
]);
but i should get this:
array:1 [
"prizes" => array:1 [
"*" => array:2 [
"priority" => array:1 [
0 => "1"
]
"prize_id" => array:1 [
0 => "1"
]
]
]
]
How to get array with needed fields?
You are getting an array as the result because you are using .*. which is saying get ALL priorities for the prizes, which is why it is returning an array instead.
If you use the dot notation, you will access the only priority for the prize.
Like so:
prizes.priority
If you would like to validate for EVERY prize that you get coming in, you will use *. before hand to access each array, like so:
*.prizes.priority
Edit: bit more information here https://laravel.com/docs/master/validation#validating-arrays
My goal is to be able to update a key value inside of an array inside of an array and I'm don't know if I'm using the right php array function.
BEFORE:
array:2 [
"week_number" => 1
"games" => array:1 [
0 => array:3 [
"game_number" => 1
"umpires" => []
"teams" => []
]
]
]
AFTER:
array:2 [
"week_number" => 1
"games" => array:1 [
0 => array:3 [
"game_number" => 1
"umpires" => []
"teams" => [1,2]
]
]
]
Test Class:
private function validParams($overrides = [])
{
return array_merge_recursive([
'week_number' => 1,
'games' => [[
'game_number' => 1,
'umpires' => [],
'teams' => [],
]]
], $overrides);
}
$response = $this->actingAs($this->authorizedUser)
->post(route('games.store', ['week' => $this->week->id]), $this->validParams([
'games' => [][
[
'teams' => [1,2]
]
]
]));
If you want to update the keys... typing $array['new_key'] = $array['old_key'] will duplicate the value with 2 sets of keys.
You have a few options here. Either you create a new array and just set your desired keys or work with array_keys and array_values and mix them up... your choice
http://php.net/manual/en/ref.array.php
See the list above, there are a lot of array functions you can use... see the two above and array_map... there is virtually a great number of ways you can do this. See how your problem is best handled after reviewing the documentation.
Good luck!
This is the moment where you need unset(): Adding a value with a different key will not update or overwrite the old value but simply add another key-value pair.
Hence, add the new value fist, then unset the old one. We can use To array_walk to itterate over the array:
array_walk($array, function (& $item) {
$item['new_key'] = $item['old_key'];
unset($item['old_key']);
});
Take note of the & reference operator in the lambda function: it ensures we are working on the original array and not a copy of it.
I found this as a solution.
private function validParams($overrides = [])
{
return array_replace_recursive([
'week_number' => 1,
'games' => [
0 => [
'game_number' => 1,
'umpires' => [],
'teams' => [],
]
]
], $overrides);
}
->post(route('games.store', ['week' => $this->week->id]), $this->validParams([
'games' => [
0 => [
'teams' => [1,2]
]
]
]));
It sounded crazy simple to me at first but I can't find the solution!
Here is My collection :
Collection {#433
#items: array:432 [
0 => array:5 [
"word_id" => 12218
"name" => "ordered"
"rank" => 12217
"is_real" => 1
"id" => 1
]
1 => array:5 [
"word_id" => 12097
"name" => "one-dimensional"
"rank" => 12096
"is_real" => 1
"id" => 2
]
2 => array:5 [
"word_id" => 19679
"name" => "watery"
"rank" => 19678
"is_real" => 1
"id" => 3
]
.
.
.
But I want it to be like this :
Collection {#433
#items: array:432 [
0 => array:5 [
"name" => "ordered"
"id" => 1
]
1 => array:5 [
"name" => "one-dimensional"
"id" => 2
]
2 => array:5 [
"name" => "watery"
"id" => 3
]
.
.
.
How can it be done with laravel collection? Do I have to change my collection to array and do the manipulation myself? How?
Or you can also use
$collection = $collection ->map(function ($item) {
return collect($item)->forget(['work_id','rank','is_real']);
});
$collection = $collection->map(function ($item) {
return array_only($item, ['id', 'name']);
});
You can use the only() method.
The only method returns the items in the collection with the specified
keys
$collection = $collection->map(function ($item) {
return $item->only(['id', 'name'])
});
This way your collection still remains as collections;
Please note, only() method is only available for Laravel collections
not for an array
An alternative approach could be to use the Arr::only() helper to reduce the items:
$collection = $collection->map(static fn($item) => Arr::only($item, ['id', 'name']));