php-school / learn-you-php

     * @param  string  $substring The substring to add if not present

     * @return Stringy Object with its $str prefixed by the $substring

     */

    public function ensureLeft($substring)

    {

        $stringy = static::create($this->str, $this->encoding);

        if (!$stringy->startsWith($substring)) {

            $stringy->str = $substring . $stringy->str;

        }

        return $stringy;

    }

    /**

     * Ensures that the string begins with $substring. If it doesn't, it's

     * @param  string  $substring The substring to add if not present

     * @return Stringy Object with its $str suffixed by the $substring

     */

    public function ensureRight($substring)

    {

        $stringy = static::create($this->str, $this->encoding);

        if (!$stringy->endsWith($substring)) {

            $stringy->str .= $substring;

        }

        return $stringy;

    }

    /**

     * Returns the first $n characters of the string.