<?php

function csv_to_array($csv,$has_headings=false,$delimiter=',',$enclosure='"',$escape="//",$eol="\n")
...

require 'csv'

records     = CSV.readlines("source.csv")
...

<?php
// $arraydata contains the mysql results in array 

...

# sum an an array's elements
def sum_row(a)
  sum = 0
...

def writefile(file, *linedata)
	linedata.each do |line| 	
		file << line.join(",") + "\n"
...

require 'csv'

def sort_csv(filename, fields = ["ID"], reverse = false)
...