(PHP 4 >= 4.2.0, PHP 5, PHP 7) Retrieve the result from the last multibyte regular expression match

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Regular expression match with multibyte support

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Set/Get HTTP output character encoding

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Replace regular expression with multibyte support ignoring case

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Encode string for MIME header

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Get truncated string with specified width

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Set/Get character encoding for multibyte regex

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Callback function converts character encoding in output buffer

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Convert "kana" one from another ("zen-kaku", "han-kaku" and more)

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Make a string lowercase