function to create an associative array from csv file using fgetcsv.

php_convert-to-csv.php

 <?php
// add some classes or add this function to your class
    public function convertToCsv(){
        $file = fopen(base_url('mycsv.csv'), 'r'); // take file location

        $arr = array(); $x = 0; $index = array(); // prepare variable for container and index
        while (($line = fgetcsv($file)) !== FALSE) { // iteration on each line of csv
            //$line is an array of the csv elements
            if($x == 0){ // for the first line, use it as index
                foreach($line as $k => $v){ // iterate the first line
                    $index[$k] = $v; // place it to index variable
                }
                $x++; // add flag 
            } else {
                $y = 0; // for indexing line
                foreach($index as $k => $v){ // iterate the index
                    $arr[$x-1][$v] = $line[$y]; 
                    $y++;
                }
                $x++;
            }
        }
        fclose($file); // close the file

        print_r($arr); // print array
    }