Problems with parsing ruby ​​syntax, what does it mean?

Question

ruby

There is a function in Ruby:

def signature h
    sorted_params = h.to_a.sort{|x, y| x[0].to_s <=> y[0].to_s} #1
       s = ""
       sorted_params.each{|k, v| s += "#{k}=#{v}"} #2
       s += "62f8"
       sig = Digest::MD5.hexdigest(s)
       sig
  end

an object of a similar form h = {e: "aaa", b: "aaa"} is passed to the f- th,
as I understand it in the first line # 1, this object is converted into an array, then assigned in a sorted form.
So I didn’t understand a little how to get the same line in php?
Does line #2 just concatenate key-value? without any spaces?
And why there is no return word in ruby, as I understand it, the value at the end is returned here.
Yes, thanks, I already found out this by practical means)
Such a question remained when you glue it into a string, in PHP boolean variables are represented as 1, and in ruby ​​as "true"
because of this, md5 is different, how can this be fixed?
____
Thank you all, figured out
json_encode($bool)

Answer 1

Sorted by key: php.net/manual/en/function.ksort.php Spliced
​​into string key1=value1key2=value2key3=value3
Secret key 62f8 added at the end
Considered md5 php.net/manual/en/function.md5.php Must
be watched on the documentation of the payment (apparently) system for which this code, and not in the code itself.