(PHP 4 >= 4.0.6, PHP 5, PHP 7) Set/Get character encoding detection order

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

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Regular expression match for multibyte string

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

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

(PHP 5 >= 5.3.0, PHP 7) Get aliases of a known encoding type

(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) Get truncated string with specified width

(PHP 5 >= 5.2.0, PHP 7) Finds position of first occurrence of a string within another, case insensitive

(PHP 4 >= 4.4.3, PHP 5 >= 5.1.3, PHP 7) Check if the string is valid for the specified encoding