convert txt to csv in php

http://php.net/manual/en/function.fgetcsv.php
Sample usage for small files:-
-------------------------------------
<?php
$importer = new CsvImporter("small.txt",true); $data = $importer->get(); print_r($data); ?>

Sample usage for large files:-
-------------------------------------
<?php
$importer = new CsvImporter("large.txt",true);
while($data = $importer->get(2000))
{ print_r($data);
} ?>

And heres the class:-
-------------------------------------
<?php class CsvImporter {
    private $fp;
    private $parse_header;
    private $header;
    private $delimiter;
    private $length;
    //--------------------------------------------------------------------
    function __construct($file_name, $parse_header=false, $delimiter="\t", $length=8000)
    {
        $this->fp = fopen($file_name, "r");
        $this->parse_header = $parse_header;
        $this->delimiter = $delimiter;
        $this->length = $length;
        $this->lines = $lines;

        if ($this->parse_header)
        {
           $this->header = fgetcsv($this->fp, $this->length, $this->delimiter);
        }

    }
    //--------------------------------------------------------------------
    function __destruct()
    {
        if ($this->fp)
        {
            fclose($this->fp);
        }
    }
    //--------------------------------------------------------------------
    function get($max_lines=0)
    {
        //if $max_lines is set to 0, then get all the data

        $data = array();

        if ($max_lines > 0)
            $line_count = 0;
        else
            $line_count = -1; // so loop limit is ignored

        while ($line_count < $max_lines && ($row = fgetcsv($this->fp, $this->length, $this->delimiter)) !== FALSE)
        {
            if ($this->parse_header)
            {
                foreach ($this->header as $i => $heading_i)
                {
                    $row_new[$heading_i] = $row[$i];
                }
                $data[] = $row_new;
            }
            else
            {
                $data[] = $row;
            }

            if ($max_lines > 0)
                $line_count++;
        }
        return $data;
    }
    //--------------------------------------------------------------------
} ?>