gistfile1.php

<?php

abstract class TypeObject
{
    protected $type;

    protected $value;

    public function __construct($value)
    {
        $this->setType(strtolower(get_called_class()));
        $this->setValue($value);
    }

    public function equal(TypeObject $object)
    {
        return $this->getType() == $object->getType() && $this->getValue() == $object->getValue();
    }

    public function setValue($value)
    {
        $this->value = $value;
        return $this;
    }

    public function getValue()
    {
        return $this->value;
    }

    protected function setType($type)
    {
        $this->type = $type;
        return $this;
    }

    public function getType()
    {
        return $this->type;
    }
}

class Int extends TypeObject
{
    public function setValue($value)
    {
        $value = (int) $value;
        return parent::setValue($value);
    }
}

function load_type($type) {
    // carrega o arquivo de $type
}

function call_type($type, $value)
{
    if (!class_exists($type)) {
        load_type($type);
    }

    return (new $type($value));
}

$types = array('number', 'int', 'float', 'double', 'string');

foreach($types as $type) {
    eval("function {$type}(\$value) {
            return call_type(__FUNCTION__, \$value);
    }");
}


if (Int(1)->equal(Int(1))) {
    echo Int(1)->getType();
} else {
    echo 'false';
}