$langs = array('python', 'java', 'ruby');
$string = implode(', ', $langs);
echo $string;
// => python, java, ruby

puts ['perl', 'python', 'java'].join(', ');
# => python, java, ruby

$my_string = 'perl, python, java';
$array = explode(', ', $my_string);
var_dump($a);
/*
Array (
	[0] => perl
	[1] => python
	[2] => java
)
*/

my_string = 'perl, python, java';
puts my_string.split(', ');
# => ["perl", "python", "java"]

$a = array('a', 'b', 'c', 'd');
shuffle($a);
print_r($a);
/*
Array (
	[0] => d
	[1] => b
	[2] => c
	[3] => a
)
*/

a = [ "a", "b", "c", "d" ];
puts a.sort_by{ rand };
# => ["d", "b", "c", "a"]

$a = array('a', 'b', 'e', 'g', 'c', 'd');
sort($a);
print_r($a);
/*
Array (
	[0] => a
	[1] => b
	[2] => c
	[3] => d
	[4] => e
	[5] => g
)
*/

a = [ "d", "a", "e", "c", "b" ];
puts a.sort;
# => ["a", "b", "c", "d", "e"]

$a = array('first' => 1, 'second' => 2);
echo count($a);
// => 2

my_array = [1, 2];
puts my_array.length;
# => 2