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https://github.com/athari/yalinqo
Yet Another LINQ to Objects for PHP [Simplified BSD]
https://github.com/athari/yalinqo
functional functional-programming library linq linq-to-objects php query statistics underscore
Last synced: about 3 hours ago
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Yet Another LINQ to Objects for PHP [Simplified BSD]
- Host: GitHub
- URL: https://github.com/athari/yalinqo
- Owner: Athari
- License: bsd-2-clause
- Created: 2012-05-13T07:28:45.000Z (over 12 years ago)
- Default Branch: master
- Last Pushed: 2024-01-23T09:10:14.000Z (11 months ago)
- Last Synced: 2024-12-22T21:02:44.529Z (about 3 hours ago)
- Topics: functional, functional-programming, library, linq, linq-to-objects, php, query, statistics, underscore
- Language: PHP
- Homepage: https://athari.github.io/YaLinqo
- Size: 982 KB
- Stars: 443
- Watchers: 23
- Forks: 39
- Open Issues: 19
-
Metadata Files:
- Readme: readme.md
- License: license.md
Awesome Lists containing this project
README
# *YaLinqo: Yet Another LINQ to Objects for PHP*
[](https://travis-ci.org/Athari/YaLinqo)
[](https://coveralls.io/r/Athari/YaLinqo)
[](https://scrutinizer-ci.com/g/Athari/YaLinqo)
[](https://insight.sensiolabs.com/projects/d1273f86-85e3-4076-a037-a40062906329)
[](https://www.versioneye.com/php/athari:yalinqo)
[](https://packagist.org/packages/athari/yalinqo)
[](https://www.versioneye.com/php/athari:yalinqo/references)
[](https://packagist.org/packages/athari/yalinqo)
[](license.md)
* [**Online documentation**](http://athari.github.io/YaLinqo)
* [**GitHub repository**](https://github.com/Athari/YaLinqo)
Features
========
* The most complete port of .NET LINQ to PHP, with [many additional methods](#implemented-methods).
* Lazy evaluation, error messages and other behavior of original LINQ.
* [Detailed PHPDoc and online reference](http://athari.github.io/YaLinqo) based on PHPDoc for all methods. Articles are adapted from original LINQ documentation from MSDN.
* 100% unit test coverage.
* Best performance among full-featured LINQ ports (YaLinqo, Ginq, Pinq), at least 2x faster than the closest competitor, see [performance tests](https://github.com/Athari/YaLinqoPerf).
* Callback functions can be specified as closures (like `function ($v) { return $v; }`), PHP "function pointers" (either strings like `'strnatcmp'` or arrays like `array($object, 'methodName')`), string "lambdas" using various syntaxes (`'"$k = $v"'`, `'$v ==> $v+1'`, `'($v, $k) ==> $v + $k'`, `'($v, $k) ==> { return $v + $k; }'`).
* Keys are as important as values. Most callback functions receive both values and the keys; transformations can be applied to both values and the keys; keys are never lost during transformations, if possible.
* SPL interfaces `Iterator`, `IteratorAggregate` etc. are used throughout the code and can be used interchangeably with Enumerable.
* Redundant collection classes are avoided, native PHP arrays are used everywhere.
* Composer support ([package](https://packagist.org/packages/athari/yalinqo) on Packagist).
* No external dependencies.
Implemented methods
===================
Some methods had to be renamed, because their names are reserved keywords. Original methods names are given in parenthesis.
* **Generation**: cycle, emptyEnum (empty), from, generate, toInfinity, toNegativeInfinity, matches, returnEnum (return), range, rangeDown, rangeTo, repeat, split;
* **Projection and filtering**: cast, ofType, select, selectMany, where;
* **Ordering**: orderBy, orderByDescending, orderByDir, thenBy, thenByDescending, thenByDir;
* **Joining and grouping**: groupJoin, join, groupBy;
* **Aggregation**: aggregate, aggregateOrDefault, average, count, max, maxBy, min, minBy, sum;
* **Set**: all, any, append, concat, contains, distinct, except, intersect, prepend, union;
* **Pagination**: elementAt, elementAtOrDefault, first, firstOrDefault, firstOrFallback, last, lastOrDefault, lastOrFallback, single, singleOrDefault, singleOrFallback, indexOf, lastIndexOf, findIndex, findLastIndex, skip, skipWhile, take, takeWhile;
* **Conversion**: toArray, toArrayDeep, toList, toListDeep, toDictionary, toJSON, toLookup, toKeys, toValues, toObject, toString;
* **Actions**: call (do), each (forEach), write, writeLine.
In total, more than 80 methods.
Example
=======
*Process sample data:*
```php
// Data
$products = array(
array('name' => 'Keyboard', 'catId' => 'hw', 'quantity' => 10, 'id' => 1),
array('name' => 'Mouse', 'catId' => 'hw', 'quantity' => 20, 'id' => 2),
array('name' => 'Monitor', 'catId' => 'hw', 'quantity' => 0, 'id' => 3),
array('name' => 'Joystick', 'catId' => 'hw', 'quantity' => 15, 'id' => 4),
array('name' => 'CPU', 'catId' => 'hw', 'quantity' => 15, 'id' => 5),
array('name' => 'Motherboard', 'catId' => 'hw', 'quantity' => 11, 'id' => 6),
array('name' => 'Windows', 'catId' => 'os', 'quantity' => 666, 'id' => 7),
array('name' => 'Linux', 'catId' => 'os', 'quantity' => 666, 'id' => 8),
array('name' => 'Mac', 'catId' => 'os', 'quantity' => 666, 'id' => 9),
);
$categories = array(
array('name' => 'Hardware', 'id' => 'hw'),
array('name' => 'Operating systems', 'id' => 'os'),
);
// Put products with non-zero quantity into matching categories;
// sort categories by name;
// sort products within categories by quantity descending, then by name.
$result = from($categories)
->orderBy('$cat ==> $cat["name"]')
->groupJoin(
from($products)
->where('$prod ==> $prod["quantity"] > 0')
->orderByDescending('$prod ==> $prod["quantity"]')
->thenBy('$prod ==> $prod["name"]'),
'$cat ==> $cat["id"]', '$prod ==> $prod["catId"]',
'($cat, $prods) ==> array(
"name" => $cat["name"],
"products" => $prods
)'
);
// Alternative shorter syntax using default variable names
$result2 = from($categories)
->orderBy('$v["name"]')
->groupJoin(
from($products)
->where('$v["quantity"] > 0')
->orderByDescending('$v["quantity"]')
->thenBy('$v["name"]'),
'$v["id"]', '$v["catId"]',
'array(
"name" => $v["name"],
"products" => $e
)'
);
// Closure syntax, maximum support in IDEs, but verbose and hard to read
$result3 = from($categories)
->orderBy(function ($cat) { return $cat['name']; })
->groupJoin(
from($products)
->where(function ($prod) { return $prod["quantity"] > 0; })
->orderByDescending(function ($prod) { return $prod["quantity"]; })
->thenBy(function ($prod) { return $prod["name"]; }),
function ($cat) { return $cat["id"]; },
function ($prod) { return $prod["catId"]; },
function ($cat, $prods) {
return array(
"name" => $cat["name"],
"products" => $prods
);
}
);
print_r($result->toArrayDeep());
```
*Output (compacted):*
```
Array (
[hw] => Array (
[name] => Hardware
[products] => Array (
[0] => Array ( [name] => Mouse [catId] => hw [quantity] => 20 [id] => 2 )
[1] => Array ( [name] => CPU [catId] => hw [quantity] => 15 [id] => 5 )
[2] => Array ( [name] => Joystick [catId] => hw [quantity] => 15 [id] => 4 )
[3] => Array ( [name] => Motherboard [catId] => hw [quantity] => 11 [id] => 6 )
[4] => Array ( [name] => Keyboard [catId] => hw [quantity] => 10 [id] => 1 )
)
)
[os] => Array (
[name] => Operating systems
[products] => Array (
[0] => Array ( [name] => Linux [catId] => os [quantity] => 666 [id] => 8 )
[1] => Array ( [name] => Mac [catId] => os [quantity] => 666 [id] => 9 )
[2] => Array ( [name] => Windows [catId] => os [quantity] => 666 [id] => 7 )
)
)
)
```
Requirements
============
* Version 1 (stable): PHP 5.3 or higher.
* Version 2 (stable): PHP 5.5 or higher.
* Version 3 (pre-alpha): PHP 7.0 or higher.
Usage
=====
Add to `composer.json`:
```json
{
"require": {
"athari/yalinqo": "^2.0"
}
}
```
Add to your PHP script:
```php
require_once 'vendor/autoloader.php';
use \YaLinqo\Enumerable;
// 'from' can be called as a static method or via a global function shortcut
Enumerable::from(array(1, 2, 3));
from(array(1, 2, 3));
```
License
=======
[**Simplified BSD License**](license.md)
Copyright © 2012–2018, Alexander Prokhorov
All rights reserved.
Links
=====
### YaLinqo Articles
* **CodeProject** *(English):*
* [LINQ for PHP comparison: YaLinqo, Ginq, Pinq](http://www.codeproject.com/Articles/997238/LINQ-for-PHP-comparison-YaLinqo-Ginq-Pinq) — performance comparison of full-featured LINQ ports, with some additional information.
* **Habrahabr** *(Russian):*
* [Comparison of old LINQ libraries](http://habrahabr.ru/post/147612/) — comparison of *LINQ for PHP*, *Phinq*, *PHPLinq* and *Plinq*, also *Underscore.php*.
* [YaLinqo 1.0 with updated comparison](http://habrahabr.ru/post/147848/) — explanation of architecture and design decisions.
* [YaLinqo 2.0](http://habrahabr.ru/post/229763/) — switch to PHP 5.5 with generators support and related changes.
* [LINQ for PHP: speed matters](http://habrahabr.ru/post/259155/) — performance comparison of full-featured LINQ ports (YaLinqo, Ginq, Pinq).
* **Other** *(English):*
* Tute Wall: [How to use Linq in PHP](http://tutewall.com/how-to-use-linq-in-php-part-01/) by *Mr. X* — a series of posts covering basic usage of YaLinqo.
### Related projects
* [**linq.js**](http://linqjs.codeplex.com/) — LINQ for JavaScript. The one and only complete port of .NET LINQ to JavaScript.
* [**Underscore.js**](http://documentcloud.github.com/underscore/) — library for functional programming in JavaScript. Similar to LINQ, but different method names and no lazy evaluation.
* [**Underscore.php**](http://brianhaveri.github.com/Underscore.php/) — port of Underscore.js to PHP.
* [**RxPHP**](https://github.com/ReactiveX/RxPHP) — reactive (push) counterpart of the active (pull) LINQ, port of Rx.NET.
* [**YaLinqoPerf**](https://github.com/Athari/YaLinqoPerf) — collection of performance tests comparing raw PHP, array functions, YaLinqo, YaLinqo with string lambdas, Ginq, Ginq with property accessors, Pinq.