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run code in 300+ PHP versions simultaneously

@ 2017-06-19T19:58:29Z

<?php

interface ProcessInterface
{
}

interface RewindIterator extends Iterator
{
    public function previous(): void;
}

interface ProcessListInterface extends RewindIterator
{
    public function append(ProcessInterface $process): void;
    public function clear(): void;
    public function isEmpty(): bool;
}

final class ProcessList implements ProcessListInterface
{
    private $processes = [];

    public function __construct(array $processes = [])
    {
        foreach ($processes as $process) {
            $this->append($process);
        }
    }

    public function append(ProcessInterface $process): void
    {
        $this->processes[] = $process;
    }

    public function clear(): void
    {
        $this->processes = [];
    }

    public function isEmpty(): bool
    {
        return empty($this->processes);
    }

    public function rewind(): ProcessInterface
    {
        return reset($this->processes);
    }

    public function current(): ProcessInterface
    {
        return current($this->processes);
    }

    public function key(): int
    {
        return key($this->processes);
    }

    public function next(): ProcessInterface
    {
        return next($this->processes);
    }
    
    public function previous(): ProcessInterface
    {
        return prev($this->processes);
    }

    public function valid(): bool
    {
        return key($this->processes) !== null;
    }
}

Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: Fatal error: Declaration of ProcessList::previous(): ProcessInterface must be compatible with RewindIterator::previous(): void in /in/STpuP on line 65
Process exited with code 255.
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Fatal error: Declaration of ProcessList::previous(): ProcessInterface must be compatible with RewindIterator::previous(): void in /in/STpuP on line 65
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33: Fatal error: Declaration of ProcessList::previous(): ProcessInterface must be compatible with RewindIterator::previous(): void in /in/STpuP on line 19
Process exited with code 255.

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