Match.php

<?php

class Match
{
    protected $value;
    protected $result;
    protected $hasMatch;

    public function __construct($value)
    {
        $this->value = $value;
        $this->result = null;
        $this->hasMatch = false;
    }

    public function when($condition, $result)
    {
        if ($this->hasMatch) {
            return $this;
        }

        if (is_callable($condition) ? $condition($this->value) : $condition) {
            $this->result = $result;
            $this->hasMatch = true;
        }

        return $this;
    }

    public function otherwise($value)
    {
        if ($this->hasMatch) {
            return is_callable($this->result) ? ($this->result)($this->value) : $this->result;
        }

        return is_callable($value) ? $value($this->value) : $value;
    }

    public function otherwiseThrow($value)
    {
        throw (new self($value))
            ->when(is_callable($value), function ($value) {
                return $value($this->value);
            })
            ->when($value instanceof \Throwable, $value)
            ->otherwise(function ($value) {
                return new $value;
            });
    }
}

function match($value)
{
    return new Match($value);
}

Looks great, I would change case function to when in name

match($something)->when('is_array', "This is a array!");

Thanks for your feedback! when is the word I was looking for. I've updated the code :)

I've created a package for this: https://github.com/skollro/otherwise