Drupal: Programmatically read and process CSV file using Feeds CSV parser

process_csv.php

<?php
/**
 * Quick CSV parsing in Drupal 7, using CSV parser library in the Feeds module.
 * Default encoding expected to be UTF8.
 * 
 */

// Custom variables, adjust to your needs
$file_name = 'public://custom_path_to_my_file.csv'
$delimiter = ';';
$limit = 0;
$start = 0;

// Load and configure parser.
feeds_include_library('ParserCSV.inc', 'ParserCSV');
$parser = new ParserCSV();
$parser->setDelimiter($delimiter);
$iterator = new ParserCSVIterator($file_name);
$parser->setLineLimit($limit);
$parser->setStartByte($start);
$rows = $parser->parse($iterator);

/**
 *  At this point, $rows is an associative array with the following structure, where each value represents a column in the CSV file
 *  [0]=> string
 *  [1]=> string
 *  ...
 *  [n]=> string
 */
foreach ($rows as $row) {
  // Custom processing
}

?>