(PHP 4 >= 4.0.6, PHP 5, PHP 7) Decode string in MIME header field

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

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

(PHP 7) Get the general category value for a code point

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

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Get the pattern used by the formatter

(PHP 7) Check if code point is a hexadecimal digit

(No version information available, might only be in Git) Get index of current position

(PHP 4 >= 4.0.6, PHP 5, PHP 7) Set/Get substitution character

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