practice for php.

RbArray.php

<?php
class RbArray
{
    function __construct(){
        $this->array = $this->get_val(func_get_args());
    }

    private function get_val($val){
        if(is_array($val) && is_array($val[0])){
            return $this->get_val($val[0]);
        } else {
            return $val;
        }
    }

    public function each($func){
        foreach($this->array as $item){
            $func($item);
        }
        return $this;
    }

    public function map($func){
        return new $this(array_map($func, $this->array));
    }

    public function reduce($init, $func){
        return array_reduce($this->array, $func, $init);
    }

    public function reverse(){
        return new $this(array_reverse($this->array));
    }
}

$a = new RbArray(1, 2, 3, 4, 5);

$a->reverse()
    ->map(function($x){return $x * $x;})
    ->each(function($i){print($i."¥n");});