Laravel collections an overview - Laravel SP

An array is a data structure that contains a
group of elements.
"
https://techterms.com/definition/array

<?php
$array = array(
'foo' => 'bar',
'bar' => 'foo',
);
// as of PHP 5.4
$array = [
'foo' => 'bar',
'bar' => 'foo',
];
?>
http://php.net/manual/en/language.types.array.php

The IlluminateSupportCollection class
provides a fluent, convenient wrapper for
working with arrays of data.
"
https://laravel.com/docs/5.0/collections

In computer science, a collection or
container is a grouping of some variable
number of data items (possibly zero) that
have some shared significance to the
problem being solved and need to be
operated upon together in some controlled
fashion.
"
https://en.wikipedia.org/wiki/Collection_(abstract_data_type)

$collection = collect([ 1, 2, 3 ]);
$collection = collect([ 'foo', 'bar' ]);
https://laravel.com/docs/collections
$collection = collect([ new User() ]);

$collection = collect([ 1, 2, 3 ]);
$collection = collect([ 'foo', 'bar' ]);
$collection = collect([ new User() ]);
https://laravel.com/docs/collections

use IlluminateSupportCollection;
$collection = new Collection();

IT SEEMS TO
BE THE
SAME THING...

$collection = collect([
'bar', 'foo'
]);
$array = [
'foo' => 'bar',
'bar' => 'foo',
];

HOW WOULD
YOU DO A SUM
FUNCTION?

<?php
$numbers = [
1,
2,
3
];
$total = 0;
for ($i = 0; $i < count($numbers); $i++) {
$total += $numbers[$i];
}
SUM

<?php
$numbers = [
1,
2,
3
];
$collection = collect($numbers);
$collection->sum();
SUM

HOW WOULD
YOU DO AN
AVG
FUNCTION?

<?php
$numbers = [
1,
2,
3
];
$total = 0;
$total += $numbers[$i];
}
$total = $total / count($numbers);
AVG

<?php
$numbers = [
1,
2,
3
];
$collection->avg();
AVG

HOW WOULD
YOU DO A
SORT
FUNCTION?

<?php
$data = [
'c',
'd',
'a',
'b'
];
sort($data);
SORT

<?php
$data = [
'c',
'd',
'a',
'b'
];
$collection = collect($data);
$result = $collection->sort();
$values = $result->values()->all();
SORT

<?php
$numbers = [
1,
2,
3
];
$numbers[4];
NOTICE

<?php
$numbers = [
1,
2,
3
];
$collection->get(4);
NOTICE
NULL

<?php
$numbers = [
1,
2,
3
];
$collection->get(4, 0);
NOTICE
0 (Zero)

<?php
$numbers = [
1,
2,
3
];
$numbers[$i] = $numbers[$i] * 2;
}
MAP

<?php
$numbers = [
1,
2,
3
];
$result = $collection->map(function($item, $key) {
return $item * 2;
});
MAP

<?php
$numbers = [
1,
2,
3
];
if ($numbers[$i] === 2) {
unset($numbers[$i]);
}
}
FILTER

<?php
$numbers = [
1,
2,
3
];
$result = $collection->filter(function($item, $key) {
return $item !== 2;
});
FILTER

<?php
use IlluminateSupportStr;
Collection::macro('toUpper', function () {
return $this->map(function ($value) {
return Str::upper($value);
});
});
$collection = collect(['first', 'second']);
$upper = $collection->toUpper();

<?php
$startTime = microtime(true);
for ($i = 0; $i < 10000000; $i++) {
$data = [
'c',
'd',
'a',
'b',
];
sort($data);
}
echo 'Time: ' . number_format(( microtime(true) - $startTime), 4) . ' Seconds';
https://stackoverflow.com/questions/1200214/how-can-i-measure-the-speed-of-code-written-in-php

STEP PHP TIME
First run 7.1.7 2.4553
Second run 7.1.7 2.6595
Third run 7.1.7 2.4450

STEP PHP TIME
First run 7.2.0beta1 2.0294
Second run 7.2.0beta1 2.0281
Third run 7.2.0beta1 2.7551

<?php
require 'vendor/autoload.php';
use IlluminateSupportCollection;
$startTime = microtime(true);
for ($i = 0; $i < 10000000; $i++) {
$data = [
'c',
'd',
'a',
'b'
];
$collection = collect($data);
$result = $collection->sort();
$result->values()->all();
}
echo 'Time: ' . number_format(( microtime(true) - $startTime), 4) . ' Seconds';
https://stackoverflow.com/questions/1200214/how-can-i-measure-the-speed-of-code-written-in-php

STEP PHP TIME
First run 7.1.7 11.7716
Second run 7.1.7 12.4548
Third run 7.1.7 12.2648

STEP PHP TIME
First run 7.2.0beta1 11.0426
Second run 7.2.0beta1 10.7730
Third run 7.2.0beta1 9.2139

1. Eloquent models,
return collections by
default

2. Keep your code
readable
Avoid nested loops or unnecessary logic

https://adamwathan.me/refactoring-to-collections

https://leanpub.com/laravelcollectionsunraveled

https://github.com/illuminate/support/blob/master/Collection.php

Laravel collections an overview - Laravel SP

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