Posts about PHP

PHP 5: if (\false)

Jan 7, 2022
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

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
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
Nice, now I have my first CVE :D The one I've found, not the one I've created :D
If you're using lcobucci/jwt, please upgrade.
Category: PHP • Tags: jwt, security

IsResource

Sep 28, 2021

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

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

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

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

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
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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