(PHP 4 >= 4.0.5, PHP 5, PHP 7) Retrieve internal configuration variables of iconv extension

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Set collation strength

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Create a new copy of the default timezone for this host

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Get collation attribute value

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Get the aliases of the given name

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

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Set behavior for handling repeating wall times at negative timezone offset

(PHP 7) Check if code point is an ignorable character

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Count the number of substring occurrences

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Returns part of haystack string from the first occurrence