(PHP 4 >= 4.0.6, PHP 5, PHP 7) Find position of last occurrence of a string in a string

(PHP 5, PHP 7) Returns the character count of string

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Get string length in grapheme units

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Gets the default locale value from the INTL global 'default_locale'

(PHP 4, PHP 5, PHP 7) Sets the default domain

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Tell whether a day is a weekday, weekend or a day that has a transition

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Get the error text from the last operation

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Get part of string

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Format the date/time value as a string

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Gets the keywords for the input locale