Forcing enclosure on Csv file writer

CsvFile.php

<?php

namespace Filesystem;

/**
 * Extends the native class to add a few features such as 'force_enclosure'
 */
class CsvFile extends \CleverAge\ProcessBundle\Filesystem\CsvFile
{
    /** @var bool */
    protected $forceEnclosures;

    /**
     * {@inheritdoc}
     */
    public function __construct(
        $filePath,
        $delimiter = ',',
        $enclosure = '"',
        $escape = '\\',
        array $headers = null,
        $mode = 'r',
        $forceEnclosures = false
    ) {
        parent::__construct($filePath, $delimiter, $enclosure, $escape, $headers, $mode);
        $this->forceEnclosures = $forceEnclosures;
    }

    /**
     * {@inheritdoc}
     */
    public function writeRaw(array $fields)
    {
        $this->assertOpened();
        ++$this->currentLine;

        return $this->fputcsv($this->handler, $fields, $this->delimiter, $this->enclosure, $this->escape);
    }

    /**
     * Replicate php's native fputcsv to allow overrides
     *
     * @see http://php.net/manual/en/function.fputcsv.php#77866
     *
     * @param resource $handle
     * @param array    $fields
     * @param string   $delimiter
     * @param string   $enclosure
     * @param bool     $forceEnclosures
     *
     * @return bool|int
     */
    protected function fputcsv(
        &$handle,
        array $fields = [],
        $delimiter = ',',
        $enclosure = '"',
        $forceEnclosures = false
    ) {
        $str = '';
        $escapeChar = '\\';
        /** @var string $value */
        foreach ($fields as $value) {
            $value = (string) $value; // This feels sooooo wrong...
            if ($forceEnclosures ||
                strpos($value, $delimiter) !== false ||
                strpos($value, $enclosure) !== false ||
                strpos($value, "\n") !== false ||
                strpos($value, "\r") !== false ||
                strpos($value, "\t") !== false ||
                strpos($value, ' ') !== false
            ) {
                $str2 = $enclosure;
                $escaped = 0;
                $len = \strlen($value);
                /** @noinspection ForeachInvariantsInspection We need to iterate a string */
                for ($i = 0; $i < $len; $i++) {
                    if ($value[$i] === $escapeChar) {
                        $escaped = 1;
                    } else {
                        if (!$escaped && $value[$i] === $enclosure) {
                            $str2 .= $enclosure;
                        } else {
                            $escaped = 0;
                        }
                    }
                    $str2 .= $value[$i];
                }
                $str2 .= $enclosure;
                $str .= $str2.$delimiter;
            } else {
                $str .= $value.$delimiter;
            }
        }
        $str = substr($str, 0, -1);
        $str .= "\n";

        return fwrite($handle, $str);
    }
}