php-school / learn-you-php

     *

     * @return Stringy Object with the first character of $str being lower case

     */

    public function lowerCaseFirst()

    {

        $first = mb_substr($this->str, 0, 1, $this->encoding);

        $rest = mb_substr($this->str, 1, $this->length() - 1,

            $this->encoding);

        $str = mb_strtolower($first, $this->encoding) . $rest;

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

    }

    /**

     * Returns whether or not a character exists at an index. Offsets may be

     *

     * @return Stringy Object with the first character of $str being upper case

     */

    public function upperCaseFirst()

    {

        $first = mb_substr($this->str, 0, 1, $this->encoding);

        $rest = mb_substr($this->str, 1, $this->length() - 1,

            $this->encoding);

        $str = mb_strtoupper($first, $this->encoding) . $rest;

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

    }

    /**

     * Returns the replacements for the toAscii() method.