# PHP Notes

## [**https://phptherightway.com/**](https://phptherightway.com/)

You can find useful tutorials online for Laravel in the[ Laravel documentation](https://laravel.com/docs/6.x?ref=hackernoon.com),[ Laracasts discussion forum](https://laracasts.com/discuss?ref=hackernoon.com),[ Treehouse](https://teamtreehouse.com/community/laravel-5?ref=hackernoon.com),[ Sitepoint](https://www.sitepoint.com/php/laravel-php/?ref=hackernoon.com), and[ Codebright](https://daylerees.com/codebright/?ref=hackernoon.com).

The Laravel[ Github docs](https://github.com/laravel/laravel?ref=hackernoon.com) are also extensive and provide excellent information that Symfony doesn’t provide.

**Книга Symfony:**

{% embed url="<https://symfony.com/doc/current/the-fast-track/en/index.html>" %}

**Symfony profiling:**

[**https://symfony.com/doc/current/profiler.html?ref=hackernoon.com**](https://symfony.com/doc/current/profiler.html?ref=hackernoon.com)

## [**https://www.toptal.com/php/choosing-between-symfony-and-laravel-frameworks**](https://www.toptal.com/php/choosing-between-symfony-and-laravel-frameworks)

## [**https://thephp.website/en/issue/how-does-php-engine-actually-work/**](https://thephp.website/en/issue/how-does-php-engine-actually-work/)

## [**https://hostadvice.com/how-to/how-to-deploy-a-php-application-using-docker-compose/**](https://hostadvice.com/how-to/how-to-deploy-a-php-application-using-docker-compose/)

## [**https://stackoverflow.com/questions/49302298/docker-crontab-not-found**](https://stackoverflow.com/questions/49302298/docker-crontab-not-found)

## **Как использовать yield?**:

yield + return

<https://medium.com/just-tech/working-with-php-generators-57586e61f19a>

```
$gen = (function() {
    yield 1;
    yield 2;
    // 3 is only returned after the generator has finished
    return 3;

})();

foreach ($gen as $val) {
    echo $val, PHP_EOL;
}

echo $gen->getReturn(), PHP_EOL;

// Outputs 1 2 3
```

## Как использовать Generator?:

{% embed url="<https://theiconic.tech/why-and-when-to-use-generator-instead-of-array-in-php-fe5c60231746>" %}

[**https://nikic.github.io/2012/12/22/Cooperative-multitasking-using-coroutines-in-PHP.html**](https://nikic.github.io/2012/12/22/Cooperative-multitasking-using-coroutines-in-PHP.html)

{% embed url="<https://www.php.net/manual/en/language.generators.overview.php>" %}

{% embed url="<https://alanstorm.com/php-generators-from-scratch/>" %}

{% embed url="<https://sergeyzhuk.me/2018/10/26/from-promise-to-coroutines/>" %}

[**https://medium.com/just-tech/working-with-php-generators-57586e61f19a**](https://medium.com/just-tech/working-with-php-generators-57586e61f19a)

A generator allows you to write code that uses [foreach](https://www.php.net/manual/en/control-structures.foreach.php) to iterate over a set of data without needing to build an array in memory, which may cause you to exceed a memory limit, or require a considerable amount of processing time to generate.&#x20;

```
<?php
function xrange($start, $limit, $step = 1) {
    if ($start <= $limit) {
        if ($step <= 0) {
            throw new LogicException('Step must be positive');
        }

        for ($i = $start; $i <= $limit; $i += $step) {
            yield $i;
        }
    } else {
        if ($step >= 0) {
            throw new LogicException('Step must be negative');
        }

        for ($i = $start; $i >= $limit; $i += $step) {
            yield $i;
        }
    }
}

/*
 * Note that both range() and xrange() result in the same
 * output below.
 */

echo 'Single digit odd numbers from range():  ';
foreach (range(1, 9, 2) as $number) {
    echo "$number ";
}
echo "\n";

echo 'Single digit odd numbers from xrange(): ';
foreach (xrange(1, 9, 2) as $number) {
    echo "$number ";
}
?>
```

## **Что за конструкция** **static function (как аргумент)?**

{% embed url="<https://dev.to/ryancco/the-power-of-static-in-php-4130>" %}

```
class PostsCollectionFilter
{
    public function unpublished($posts)
    {
        return $posts->filter(static function ($post) {
            return ! $post->published;
        });
    }
}
```

**В общем статическая анонимная функция прибавляет немного производительности в отличие от обычной анонимной функции. Если нам не нужен $this в этой фнкции, то мы можем указать static, но это некритично.**

It is worth noting that in context of a class, static anonymous functions yield micro performance improvements and may be suggested in any instances which you do not need the containing class to be bound to the anonymous function.

## **Как используются замыкания в PHP?**

<https://wiki.php.net/rfc/closures>

## **Для чего нужно** Late Static Bindings?

**Чтобы вызвать метод в контексте не где он объявлен, а где вызван:**

[**https://www.youtube.com/watch?v=MxRrCV\_3VSQ**](https://www.youtube.com/watch?v=MxRrCV_3VSQ)

```
class Book{

    public static $name = 'Kirill';
    
    public static function author()
    {
        return "the author name is ". self::$name;
    
    }
    
    public static function getAuthor(){
        echo static::author();
    }
}

class NewBook{

    
    public static function author()
    {
        return "the author name is ". self::$name . " and K";
    
    }
    
   
}

Book::getAuthor(); //he author name is Kirill
NewBook::getAuthor(); //he author name is Kirill and K
```

## **Когда использовать immutable objects?**

## **Посмотреть инструмент PHP metrics.**

<https://www.phpmetrics.org/>

## Те**стирование:**

**Посмотреть, как они делаются здесь.**

[**https://github.com/yiisoft/validator**](https://github.com/yiisoft/validator)

Сайт, на котором собран 61 PHP-инструмент для анализа кода, управления зависимостями, тестов: <https://phpqa.io/>\
\
А в этом репозитории ещё свыше ста линтеров, форматтеров и статических анализаторов: <https://tprg.ru/lptv>\
\
\#php #инструменты[t.me/tproger\_web/1004](https://t.me/tproger_web/1004)

**PHPStorm auto indent**

<https://plugins.jetbrains.com/plugin/7642-save-actions><br>


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