PHP 5.3, 5.4 and 5.5 examples for "new" features

Author: dstockto

.gitignore

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+\.idea
+\.hg
+\.hgignore
+\.vagrant

Coro.php

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+<?php
+
+class CoHost
+{
+    protected $id;
+
+    public function getId()
+    {
+        if (is_null($this->id)) {
+            $set = $this->setId();
+            $set->send(yield identifier());
+        }
+
+        yield $this->id;
+    }
+
+    public function setId()
+    {
+        if (is_null($this->id)) {
+            $this->id = yield;
+        }
+    }
+}
+
+function identifier()
+{
+    static $i = 0;
+    return $i++;
+}
+
+
+$host = new CoHost();
+
+
+$host->setId()->send(54);
+
+$get = $host->getId();
+
+foreach ($get as $val) {
+    echo $val;
+}

README.md

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+PHP 5.3, 5.4 and 5.5 Examples
+=============================
+
+This repository contains various examples of some of the "new" features in PHP 5.3,
+PHP 5.4 and PHP 5.5. It also contains some experiments that I ended up abandoning
+for one reason or another. This is by no means production ready code. It was built
+to show quick and easy to digest examples for a PHP meetup group. If you put it in your
+web root or start the PHP built-in web server, you should see a menu with the various
+code examples and running examples.
+
+php -S 127.0.0.1:8000
+
+Then browse to http://localhost:8000
+
+If there's another feature you'd like to see examples for, please open an issue
+or send a pull request.

Scheduler.php

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+<?php
+class Scheduler
+{
+    protected $maxTaskId = 0;
+    protected $taskMap = [];
+    protected $taskQueue;
+    protected $waitingForRead = [];
+    protected $waitingForWrite = [];
+
+    public function __construct()
+    {
+        $this->taskQueue = new SplQueue();
+    }
+
+    public function newTask(Generator $coroutine)
+    {
+        $tid = ++$this->maxTaskId;
+        $task = new Task($tid, $coroutine);
+        $this->taskMap[$tid] = $task;
+        $this->schedule($task);
+        return $tid;
+    }
+
+    public function schedule(Task $task)
+    {
+        $this->taskQueue->enqueue($task);
+    }
+
+    public function run()
+    {
+        $this->newTask($this->ioPollTask());
+
+        while(!$this->taskQueue->isEmpty()) {
+            /** @var Task $task */
+            $task = $this->taskQueue->dequeue();
+            $retval = $task->run();
+
+            if ($retval instanceof SystemCall) {
+                $retval($task, $this);
+                continue;
+            }
+
+            if ($task->isFinished()) {
+                unset($this->taskMap[$task->getTaskId()]);
+            } else {
+                $this->schedule($task);
+            }
+        }
+    }
+
+    public function killTask($tid)
+    {
+        if (!isset($this->taskMap[$tid])) {
+            return false;
+        }
+
+        unset($this->taskMap[$tid]);
+
+        foreach ($this->taskQueue as $i => $task) {
+            /** @var Task $task */
+            if ($task->getTaskId() === $tid) {
+                unset($this->taskQueue[$i]);
+                break;
+            }
+        }
+
+        echo "Scheduler killed task $tid<br>";
+        return true;
+    }
+
+    public function waitForRead($socket, Task $task)
+    {
+        if (isset($this->waitingForRead[(int) $socket])) {
+            $this->waitingForRead[(int) $socket][1][] = $task;
+        } else {
+            $this->waitingForRead[(int) $socket] = [$socket, [$task]];
+        }
+    }
+
+    public function waitForWrite($socket, Task $task)
+    {
+        if (isset($this->waitingForWrite[(int) $socket])) {
+            $this->waitingForWrite[(int) $socket][1][] = $task;
+        } else {
+            $this->waitingForWrite[(int) $socket] = [$socket, [$task]];
+        }
+    }
+
+    protected function ioPoll($timeout)
+    {
+        $rSocks = [];
+        foreach ($this->waitingForRead as list($socket)) {
+            $rSocks[] = $socket;
+        }
+
+        $wSocks = [];
+        foreach ($this->waitingForWrite as list($socket)) {
+            $wSocks[] = $socket;
+        }
+
+        $eSocks = []; // dummy
+
+        if (!stream_select($rSocks, $wSocks, $eSocks, $timeout)) {
+            return;
+        }
+
+        foreach ($rSocks as $socket) {
+            list(, $tasks) = $this->waitingForRead[(int) $socket];
+            unset($this->waitingForRead[(int) $socket]);
+
+            foreach ($tasks as $task) {
+                $this->schedule($task);
+            }
+        }
+
+        foreach ($wSocks as $socket) {
+            list(, $tasks) = $this->waitingForWrite[(int) $socket];
+            unset($this->waitingForWrite[(int) $socket]);
+
+            foreach ($tasks as $task) {
+                $this->schedule($task);
+            }
+        }
+    }
+
+    protected function ioPollTask()
+    {
+        while (true) {
+            if ($this->taskQueue->isEmpty()) {
+                $this->ioPoll(null);
+            } else {
+                $this->ioPoll(0);
+            }
+
+            yield;
+        }
+    }
+}

SystemCall.php

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+<?php
+
+class SystemCall
+{
+    protected $callback;
+
+    public function __construct(callable $callback)
+    {
+        $this->callback = $callback;
+    }
+
+    public function __invoke(Task $task, Scheduler $scheduler)
+    {
+        $callback = $this->callback;
+        return $callback($task, $scheduler);
+    }
+}

Task.php

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+<?php
+class Task
+{
+    protected $taskId;
+    protected $coroutine;
+    protected $sendValue = null;
+    protected $beforeFirstYield = true;
+
+    public function __construct($taskId, Generator $coroutine)
+    {
+        $this->taskId = $taskId;
+        $this->coroutine = $coroutine;
+    }
+
+    public function getTaskId()
+    {
+        return $this->taskId;
+    }
+
+    public function setSendValue($sendValue)
+    {
+        $this->sendValue = $sendValue;
+    }
+
+    public function run()
+    {
+        if ($this->beforeFirstYield) {
+            $this->beforeFirstYield = false;
+            return $this->coroutine->current();
+        } else {
+            $retval = $this->coroutine->send($this->sendValue);
+            $this->sendValue = null;
+            return $retval;
+        }
+    }
+
+    public function isFinished()
+    {
+        return !$this->coroutine->valid();
+    }
+}

Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+Vagrant.configure("2") do |config|
+  # All Vagrant configuration is done here. The most common configuration
+  # options are documented and commented below. For a complete reference,
+  # please see the online documentation at vagrantup.com.
+
+  # Every Vagrant virtual environment requires a box to build off of.
+  config.vm.box = "centos-62-64-puppet"
+
+  # The url from where the 'config.vm.box' box will be fetched if it
+  # doesn't already exist on the user's system.
+  # config.vm.box_url = "http://domain.com/path/to/above.box"
+
+  # Create a forwarded port mapping which allows access to a specific port
+  # within the machine from a port on the host machine. In the example below,
+  # accessing "localhost:8080" will access port 80 on the guest machine.
+  # config.vm.network :forwarded_port, guest: 80, host: 8080
+#  config.vm.network :forwarded_port, guest: 80, host: 8080
+
+  # Create a private network, which allows host-only access to the machine
+  # using a specific IP.
+  config.vm.network :private_network, ip: "10.0.1.101"
+
+  # Create a public network, which generally matched to bridged network.
+  # Bridged networks make the machine appear as another physical device on
+  # your network.
+  # config.vm.network :public_network
+
+  # Share an additional folder to the guest VM. The first argument is
+  # the path on the host to the actual folder. The second argument is
+  # the path on the guest to mount the folder. And the optional third
+  # argument is a set of non-required options.
+  # config.vm.synced_folder "../data", "/vagrant_data"
+
+  # Provider-specific configuration so you can fine-tune various
+  # backing providers for Vagrant. These expose provider-specific options.
+  # Example for VirtualBox:
+  #
+  # config.vm.provider :virtualbox do |vb|
+  #   # Don't boot with headless mode
+  #   vb.gui = true
+  #
+  #   # Use VBoxManage to customize the VM. For example to change memory:
+  #   vb.customize ["modifyvm", :id, "--memory", "1024"]
+  # end
+  #
+  # View the documentation for the provider you're using for more
+  # information on available options.
+
+  # Enable provisioning with Puppet stand alone.  Puppet manifests
+  # are contained in a directory path relative to this Vagrantfile.
+  # You will need to create the manifests directory and a manifest in
+  # the file base.pp in the manifests_path directory.
+  #
+  # An example Puppet manifest to provision the message of the day:
+  #
+  # # group { "puppet":
+  # #   ensure => "present",
+  # # }
+  # #
+  # # File { owner => 0, group => 0, mode => 0644 }
+  # #
+  # # file { '/etc/motd':
+  # #   content => "Welcome to your Vagrant-built virtual machine!
+  # #               Managed by Puppet.\n"
+  # # }
+  #
+  # config.vm.provision :puppet do |puppet|
+  #   puppet.manifests_path = "manifests"
+  #   puppet.manifest_file  = "init.pp"
+  # end
+
+  # Enable provisioning with chef solo, specifying a cookbooks path, roles
+  # path, and data_bags path (all relative to this Vagrantfile), and adding
+  # some recipes and/or roles.
+  #
+  # config.vm.provision :chef_solo do |chef|
+  #   chef.cookbooks_path = "../my-recipes/cookbooks"
+  #   chef.roles_path = "../my-recipes/roles"
+  #   chef.data_bags_path = "../my-recipes/data_bags"
+  #   chef.add_recipe "mysql"
+  #   chef.add_role "web"
+  #
+  #   # You may also specify custom JSON attributes:
+  #   chef.json = { :mysql_password => "foo" }
+  # end
+
+  # Enable provisioning with chef server, specifying the chef server URL,
+  # and the path to the validation key (relative to this Vagrantfile).
+  #
+  # The Opscode Platform uses HTTPS. Substitute your organization for
+  # ORGNAME in the URL and validation key.
+  #
+  # If you have your own Chef Server, use the appropriate URL, which may be
+  # HTTP instead of HTTPS depending on your configuration. Also change the
+  # validation key to validation.pem.
+  #
+  # config.vm.provision :chef_client do |chef|
+  #   chef.chef_server_url = "https://api.opscode.com/organizations/ORGNAME"
+  #   chef.validation_key_path = "ORGNAME-validator.pem"
+  # end
+  #
+  # If you're using the Opscode platform, your validator client is
+  # ORGNAME-validator, replacing ORGNAME with your organization name.
+  #
+  # If you have your own Chef Server, the default validation client name is
+  # chef-validator, unless you changed the configuration.
+  #
+  #   chef.validation_client_name = "ORGNAME-validator"
+end