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

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Parse string to a timestamp value

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Check if this zone has the same rules and offset as another zone

(PHP >= 5.4.0, PECL intl >= 2.0.0) Set the checks to run

(No version information available, might only be in Git) Get the current key

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

(PHP >= 5.4.0, PECL intl >= 2.0.0) Locales to use when running checks

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Get behavior for handling repeating wall time

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

(PHP 7) Get the decimal digit value of a code point for a given radix