$langs = array('php', 'ruby', 'java', 'perl', 'csharp');
$my_size = 2;
var_dump( array_chunk($langs, $my_size) );
 
/*
Array (
    [0] => Array
        (
            [0] => php
            [1] => ruby
        )
 
    [1] => Array
        (
            [0] => java
            [1] => perl
        )
 
    [2] => Array
        (
            [0] => csharp
        )
 
) )
*/

def array_chunk(full_array, size)
        number_of_chunks = (full_array.length/size.to_f).ceil;
        chunks = (1..number_of_chunks).collect { [] }
            while full_array.any?
              chunks.each do |a_chunk|
                a_chunk << full_array.shift if full_array.any?
              end
            end
        chunks
end
 
langs = ["php", "ruby", "java", "perl", "csharp"]
my_size = 2
p array_chunk(langs, my_size)
 
# => [["php", "perl"], ["ruby", "csharp"], ["java"]]