(PHP 4 >= 4.0.6, PHP 5, PHP 7) Return width of string

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

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

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Create a collator

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Default "from" callback function

(No version information available, might only be in Git) Create iterator for navigating fragments between boundaries

(PHP 7) Check if code point has the Alphabetic Unicode property

(No version information available, might only be in Git) Create break iterator for logically possible line

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Get the source convertor type

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Default "to" callback function