Import CSV into MySQL

<?php

//
// Import CSV into MySQL
//
// https://css-tricks.com/snippets/php/import-csv-into-mysql/
//

$databasehost     = 'localhost';
$databasename     = 'test';
$databasetable    = 'sample';
$databaseusername = 'test';
$databasepassword = '';
$fieldseparator   = ',';
$lineseparator    = "\n";
$csvfile          = 'filename.csv';

/********************************/
/* Would you like to add an ampty field at the beginning of these records?
/* This is useful if you have a table with the first field being an auto_increment integer
/* and the csv file does not have such as empty field before the records.
/* Set 1 for yes and 0 for no. ATTENTION: don't set to 1 if you are not sure.
/* This can dump data in the wrong fields if this extra field does not exist in the table
/********************************/
$addauto = 0;
/********************************/

/* Would you like to save the mysql queries in a file? If yes set $save to 1.
/* Permission on the file should be set to 777. Either upload a sample file through ftp and
/* change the permissions, or execute at the prompt: touch output.sql && chmod 777 output.sql
/********************************/
$save = 1;
$outputfile = 'output.sql';
/********************************/

if (!file_exists($csvfile)) {
    echo "File not found. Make sure you specified the correct path.\n";
    exit;
}

$file = fopen($csvfile, 'r');
if (!$file) {
    echo "Error opening data file.\n";
    exit;
}

$size = filesize($csvfile);
if (!$size) {
    echo "File is empty.\n";
    exit;
}

$csvcontent = fread($file, $size);

fclose($file);

$con = @mysql_connect($databasehost, $databaseusername, $databasepassword) or die(mysql_error());
@mysql_select_db($databasename) or die(mysql_error());

$lines = 0;
$queries = '';
$linearray = array();

foreach (split($lineseparator, $csvcontent) as $line) {
    ++$lines;

    $line = trim($line, " \t");
    $line = str_replace("\r", '', $line);

    /************************************
    This line escapes the special character. remove it if entries are already escaped in the csv file
    ************************************/
    $line = str_replace("'", "\'", $line);
    /*************************************/

    $linearray = explode($fieldseparator, $line);

    $linemysql = implode("','", $linearray);

    if ($addauto) {
        $query = "insert into $databasetable values('','$linemysql');";
    } else {
        $query = "insert into $databasetable values('$linemysql');";
    }

    $queries .= $query."\n";

    @mysql_query($query);
}

@mysql_close($con);

if ($save) {
    if (!is_writable($outputfile)) {
        echo "File is not writable, check permissions.\n";
    } else {
        $file2 = fopen($outputfile, 'w');
        if (!$file2) {
            echo "Error writing to the output file.\n";
        } else {
            fwrite($file2, $queries);
            fclose($file2);
        }
    }
}

echo "Found a total of $lines records in this csv file.\n";