https://github.com/willavelar/php-design-pattern-behavioral-iterator

a simple php example about the behavioral pattern: Iterator
https://github.com/willavelar/php-design-pattern-behavioral-iterator

behavioral-patterns design-patterns iterator php

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a simple php example about the behavioral pattern: Iterator

• Host: GitHub
• URL: https://github.com/willavelar/php-design-pattern-behavioral-iterator
• Owner: willavelar
• Created: 2023-10-31T19:47:11.000Z (about 1 year ago)
• Default Branch: main
• Last Pushed: 2023-10-31T20:18:34.000Z (about 1 year ago)
• Last Synced: 2023-10-31T22:24:20.418Z (about 1 year ago)
• Topics: behavioral-patterns, design-patterns, iterator, php
• Language: PHP
• Homepage:
• Size: 1.95 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
## Iterator

Iterator is a behavioral design pattern that lets you traverse elements of a collection without exposing its underlying representation (list, stack, tree, etc.).

-----

We need to create a list of budgets and then show information about them.

### The problem

This way, by grouping via array, we can place other types of information that will not be part of the budget, thus creating gaps in our code.

```php

items = 7;

$budget1->value = 1500.75;

$budget2 = new Budget();

$budget2->items = 3;

$budget2->value = 150;

$budget3 = new Budget();

$budget3->items = 5;

$budget3->value = 1350;

$budgetList = [

    $budget1,

    $budget2,

    $budget3

];

foreach ($budgetList as $budget) {

    echo "Value: ". $budget->value . PHP_EOL;

    echo "Items: ". $budget->items . PHP_EOL;

    echo PHP_EOL;

}

```

### The solution

Now, using the Itarator pattern, we create an object that is a list of budgets, which only accepts budgets, and then we make it traversable by the PHP Iterator.

```php

budget[] = $budget;

    }

    public function getIterator(): \ArrayIterator

    {

        return new \ArrayIterator($this->budget);

    }

}

```

```php

items = 7;

$budget1->value = 1500.75;

$budget2 = new Budget();

$budget2->items = 3;

$budget2->value = 150;

$budget3 = new Budget();

$budget3->items = 5;

$budget3->value = 1350;

$budgetList = new BudgetList();

$budgetList->addBudget($budget1);

$budgetList->addBudget($budget2);

$budgetList->addBudget($budget3);

foreach ($budgetList as $budget) {

    echo "Value: ". $budget->value . PHP_EOL;

    echo "Items: ". $budget->items . PHP_EOL;

    echo PHP_EOL;

}

```

-----

### Installation for test

![PHP Version Support](https://img.shields.io/badge/php-7.4%2B-brightgreen.svg?style=flat-square) ![Composer Version Support](https://img.shields.io/badge/composer-2.2.9%2B-brightgreen.svg?style=flat-square)

```bash

composer install

```

```bash

php wrong/test.php

php right/test.php

```