Posts about PHP (old posts, page 2)

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• PHP 5: if (\false)

  Jan 7, 2022 • Share

  I was wondering why the typical class alias boilerplate code uses this weird backslash in if (\false) like here for example.

  It turns out this code will wish you a happy debugging in PHP 5.3-5.6:

  <?php
  
  namespace ns;
  
  define('ns\\false', 1);
  
  if (false) {
      echo "Happy Debugging", PHP_EOL;
  }
  

  Not a very useful knowledge now but an interesting history fact.

  Category: PHP • Tags: php 5, til

• PHP 8.1 Syntax Showcase

  Nov 30, 2021 • Share

  PHP 8.1 was released when I was suffering from COVID so I'm a bit late.

  <?php
  
  enum Status
  {
      case OK;
      case Error;
  }
  
  #[SomeAttr(new SomeNestedAttr())]
  class TestTest
  {
      public function __construct(
          public readonly Status $status = Status::OK,
          private Logger $logger = new FileLogger(perm: 0o644),
      ) {}
  
      public function process(Iterator&Countable $value)
      {
          if (count($value) === 0) {
              $this->error();
          }
      }
  
      public function error(): never
      {
          $this->logger->error('Error!');
          exit;
      }
  }
  
  $test = new TestTest();
  
  $arr1 = ['a' => new ArrayObject()];
  $arr2 = ['b' => new ArrayIterator()];
  
  $result = array_map($test->process(...), [...$arr1, ...$arr2]);
  

  Category: PHP • Tags: php 8.1

• Torrent File 2.2

  Nov 30, 2021 • Share

  The torrent file library got its biggest update. Versions 2.2 / 3.0 added support for:

  • BEP-5: DHT nodes list

  • BEP-17: HTTP seed urls

  • BEP-19: WebSeed urls

  • BEP-47: sha1 sums, executable files, symlinks, padding

  • Big cleanup to support torrent v2 metadata (BEP-52) in 2.3 / 3.1

  Category: PHP • Tags: torrent

• CVE-2021-41106

  Sep 30, 2021 • Share

  Nice, now I have my first CVE :D The one I've found, not the one I've created :D

  • GitHub: https://github.com/advisories/GHSA-7322-jrq4-x5hf

  • CVE: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41106

  • NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-41106

  If you're using lcobucci/jwt, please upgrade.

  Category: PHP • Tags: jwt, security

• IsResource

  Sep 28, 2021 • Share

  Inspired by a recent discussion in the PHP Internals, I decided to provide a userland solution. Check this:

  <?php
  
  $hash = hash_init('md5');
  
  // vanilla functions:
  is_resource($hash); // true in PHP <= 7.1, false in PHP >= 7.2
  get_resource_type($hash); // "Hash Context" in PHP <= 7.1, various errors otherwise
  
  // library functions:
  \Arokettu\IsResource\is_resource($hash); // true
  \Arokettu\IsResource\get_resource_type($hash); // "Hash Context"
  

  Get it on my dev portal: https://sandfox.dev/php/is-resource.html

  Category: PHP • Tags: is_resource, php 8, php 8.1

• Pseudolocale Lib for PHP

  Jan 27, 2021 • Share

  I haven't found a good standalone pseudolocalization library for PHP so I wrote my own.

  https://sandfox.dev/php/pseudolocale.html

  Or if you're using Symfony Components or you don't mind using huge libraries for simple tasks, there is one good alternative: PseudoLocalizationTranslator in the Symfony Translation Component since version 5.2.

  Category: PHP • Tags: i18n, php, pseudolocale

• PHP 8.0 Comparison Change

  Oct 22, 2020 • Share

  Another new thing in PHP 8.0 will be slightly less madness in non strict value comparison.

  Read more…

  Category: PHP • Tags: php 8

• OOP in PHP 4 and 8

  Oct 2, 2020 • Share

  Deprecation of class name constructors means that you no longer can write OOP code that works both in PHP 4 and PHP 8 without some hackery. This works however:

  <?php
  
  class WorksIn4And8
  {
      var $int;
  
      // Regular method in PHP 4
      // Constructor in 5-8
      function __construct($int)
      {
          error_log('__construct()');
          $this->int = $int;
      }
  
      // Constructor in PHP 4
      // Constructor overridden by __construct in 5-7
      // Regular method in PHP 8
      function WorksIn4And8($int)
      {
          error_log('WorksIn4And8()');
          $this->__construct($int);
      }
  
      function getInt()
      {
          return $this->int;
      }
  }
  
  $obj = new WorksIn4And8(48);
  
  var_dump($obj->getInt());
  

  Category: PHP • Tags: php 4, php 8

• PHP 8.0 Syntax Showcase

  Sep 30, 2020 • Share

  Since RC1 is released today, I decided to make a small demonstration of PHP 8.0 syntax features.

  <?php
  
  #[FuncAttribute]
  function func(SplHeap|ArrayObject|null $object, mixed $value = null): ArrayAccess|false
  {
      return match ($object?->count()) {
          0, null => throw new RuntimeException(),
          default => $object,
      };
  }
  
  try {
      func(object: new ArrayObject());
  } catch (RuntimeException) {
      // ignore
  }
  

  Category: PHP • Tags: php 8

• Method Calls with Arbitrary Names

  Jul 24, 2020 • Share

  A discovery of the day. Many people know that you can define and read an object property with an arbitrary name:

  <?php
  
  $s = new stdClass();
  $s->{'any string here'} = 123;
  echo $s->{'any string here'}; // 123
  

  Read more…

  Category: PHP

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