Php examples

.gitignore

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+# IntelliJ project files
+.idea
+*.iml
+out
+gen

examples-per-language/php/behavioral/Chain_Of_Responsibility.php

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+<?php
+
+use designPatternsForHumans\behavioral\Chain_Of_Responsibility\Bank;
+use designPatternsForHumans\behavioral\Chain_Of_Responsibility\BitCoin;
+use designPatternsForHumans\behavioral\Chain_Of_Responsibility\Paypal;
+
+require_once __DIR__ . '/autoload.php';
+
+// Let's prepare a chain like below
+//      $bank->$paypal->$bitcoin
+
+$bank = new Bank(100);
+$paypal = new Paypal(200);
+$bitcoin = new BitCoin(300);
+
+//      First priority bank
+//      If bank can't pay then paypal
+//      If paypal can't pay then bit coin.
+$bank->setNext($paypal);
+$paypal->setNext($bitcoin);
+
+// Let's try and pay our bill.
+$bank->pay(259);

examples-per-language/php/behavioral/Command.php

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+<?php
+
+require_once __DIR__ . '/autoload.php';
+
+use designPatternsForHumans\behavioral\Command\Bulb;
+use designPatternsForHumans\behavioral\Command\RemoteControl;
+use designPatternsForHumans\behavioral\Command\TurnOff;
+use designPatternsForHumans\behavioral\Command\TurnOn;
+
+$bulb = new Bulb();
+
+$turnOn = new TurnOn($bulb);
+$turnOff = new TurnOff($bulb);
+
+$remote = new RemoteControl();
+$remote->submit($turnOn);
+$remote->submit($turnOff);

examples-per-language/php/behavioral/Iterator.php

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+<?php
+
+use designPatternsForHumans\behavioral\Iterator\RadioStation;
+use designPatternsForHumans\behavioral\Iterator\StationList;
+
+require_once __DIR__ . '/autoload.php';
+
+$stationList = new StationList();
+
+$stationList->addStation(new RadioStation(89));
+$stationList->addStation(new RadioStation(101));
+$stationList->addStation(new RadioStation(102));
+$stationList->addStation(new RadioStation(103.2));
+
+/** @var RadioStation $station */
+echo 'These are the known Radio Stations' . PHP_EOL;
+foreach ($stationList as $station) {
+    echo $station->getFrequency(). PHP_EOL;
+}
+
+$stationList->removeStation(new RadioStation(89));
+
+// To prove the station was indeed removed, we iterate through the list again.
+// Small caveat : Iterators need to be rewinded after beeing Iterated!
+$stationList->rewind();
+
+/** @var RadioStation $station */
+echo 'These are the known Radio Stations' . PHP_EOL;
+foreach ($stationList as $station) {
+    echo $station->getFrequency(). PHP_EOL;
+}
+

examples-per-language/php/behavioral/autoload.php

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+<?php
+
+spl_autoload_register(function($className) {
+  $explode = explode("\\", $className);
+  $slice = array_slice($explode, -2, 2);
+  require_once 'src' .  DIRECTORY_SEPARATOR . implode(DIRECTORY_SEPARATOR, $slice) . '.php';
+});

examples-per-language/php/behavioral/src/Chain_Of_Responsibility/Account.php

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+<?php
+
+namespace designPatternsForHumans\behavioral\Chain_Of_Responsibility;
+
+abstract class Account
+{
+    protected $balance;
+    /** @var  Account */
+    protected $successor;
+
+    public function setNext(Account $account)
+    {
+        $this->successor = $account;
+    }
+
+    public function pay($amountToPay)
+    {
+        if ($this->canPay($amountToPay)) {
+            echo sprintf('Paid %s using %s' . PHP_EOL, $amountToPay,
+              get_called_class());
+        } elseif ($this->successor) {
+            echo sprintf('Cannot pay using %s. Proceeding ...' . PHP_EOL,
+              get_called_class());
+            $this->successor->pay($amountToPay);
+        } else {
+            throw new \Exception('None of the accounts have enough balance');
+        }
+    }
+
+    public function canPay($amount)
+    {
+        return $this->balance >= $amount;
+    }
+}

examples-per-language/php/behavioral/src/Chain_Of_Responsibility/Bank.php

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+<?php
+
+namespace designPatternsForHumans\behavioral\Chain_Of_Responsibility;
+
+
+class Bank extends Account
+{
+    // In the example the balance property is redefined, but that is not
+    // necessary, since we extend Account, which has that property.
+
+
+    public function __construct($balance)
+    {
+        $this->balance = $balance;
+    }
+}

examples-per-language/php/behavioral/src/Chain_Of_Responsibility/BitCoin.php

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+<?php
+
+namespace designPatternsForHumans\behavioral\Chain_Of_Responsibility;
+
+
+class BitCoin extends Account
+{
+    // In the example the balance property is redefined, but that is not
+    // necessary, since we extend Account, which has that property.
+
+
+    public function __construct($balance)
+    {
+        $this->balance = $balance;
+    }
+}

examples-per-language/php/behavioral/src/Chain_Of_Responsibility/Paypal.php

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+<?php
+
+namespace designPatternsForHumans\behavioral\Chain_Of_Responsibility;
+
+
+class Paypal extends Account
+{
+    // In the example the balance property is redefined, but that is not
+    // necessary, since we extend Account, which has that property.
+
+
+    public function __construct($balance)
+    {
+        $this->balance = $balance;
+    }
+}

examples-per-language/php/behavioral/src/Command/Bulb.php

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+<?php
+
+namespace designPatternsForHumans\behavioral\Command;
+
+
+// This is the receiver, it has the implementation of the actions we want to perform.
+class Bulb
+{
+    public function turnOn()
+    {
+        echo 'Bulb has been lit!' . PHP_EOL;
+    }
+
+    public function turnOff()
+    {
+        echo 'Darkness!' . PHP_EOL;
+    }
+
+}

examples-per-language/php/behavioral/src/Command/Command.php

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+<?php
+
+namespace designPatternsForHumans\behavioral\Command;
+
+
+interface Command
+{
+    public function execute();
+    public function undo();
+    public function redo();
+
+}

examples-per-language/php/behavioral/src/Command/RemoteControl.php

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+<?php
+
+namespace designPatternsForHumans\behavioral\Command;
+
+// This is the invoker, this will be used by client to interact.
+class RemoteControl
+{
+    public function submit(Command $command)
+    {
+        $command->execute();
+    }
+
+}

examples-per-language/php/behavioral/src/Command/TurnOff.php

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+<?php
+
+namespace designPatternsForHumans\behavioral\Command;
+
+
+class TurnOff implements Command
+{
+
+    protected $bulb;
+
+    public function __construct(Bulb $bulb)
+    {
+        $this->bulb = $bulb;
+    }
+
+    public function execute()
+    {
+        $this->bulb->turnOff();
+    }
+
+    public function undo()
+    {
+        $this->bulb->turnOn();
+    }
+
+    public function redo()
+    {
+        $this->execute();
+    }
+}

examples-per-language/php/behavioral/src/Command/TurnOn.php

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+<?php
+
+namespace designPatternsForHumans\behavioral\Command;
+
+
+class TurnOn implements Command
+{
+
+    protected $bulb;
+
+    public function __construct(Bulb $bulb)
+    {
+        $this->bulb = $bulb;
+    }
+
+    public function execute()
+    {
+        $this->bulb->turnOn();
+    }
+
+    public function undo()
+    {
+        $this->bulb->turnOff();
+    }
+
+    public function redo()
+    {
+        $this->execute();
+    }
+}

examples-per-language/php/behavioral/src/Iterator/RadioStation.php

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+<?php
+
+namespace designPatternsForHumans\behavioral\Iterator;
+
+
+class RadioStation
+{
+    protected $frequency;
+
+    public function __construct($frequency)
+    {
+        $this->frequency = $frequency;
+    }
+
+    public function getFrequency()
+    {
+        return $this->frequency;
+    }
+}

examples-per-language/php/behavioral/src/Iterator/StationList.php

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+<?php
+
+namespace designPatternsForHumans\behavioral\Iterator;
+
+use Countable;
+use Iterator;
+
+class StationList implements Countable, Iterator
+{
+
+    protected $stations = [];
+    protected $counter;
+
+    public function addStation(RadioStation $station)
+    {
+        $this->stations[] = $station;
+    }
+
+    public function removeStation(RadioStation $toRemove)
+    {
+        $toRemoveFrequency = $toRemove->getFrequency();
+        $this->stations = array_filter($this->stations, function (RadioStation $station) use ($toRemoveFrequency) {
+            return $station->getFrequency() !== $toRemoveFrequency;
+        });
+    }
+
+    public function current()
+    {
+        return $this->stations[$this->counter];
+    }
+
+    public function next()
+    {
+        $this->counter++;
+    }
+
+    public function key()
+    {
+        return $this->counter;
+    }
+
+    public function valid()
+    {
+        return isset($this->stations[$this->counter]);
+    }
+
+    public function rewind()
+    {
+        // When using a numbered array like we do with $counter, we need to reset
+        // the array as well, otherwise the removed station will wreak havoc with
+        // our iteration, because the value of removed station at position X will
+        // be NULL;
+        $this->stations = array_values($this->stations);
+        return $this->counter = 0;
+    }
+
+    public function count()
+    {
+        return count($this->stations);
+    }
+}