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

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Get last error message on the object

(PHP 5 >= 5.3.0, PECL intl >= 1.0.0) Sets the time zone to use

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Setup string and regular expression for a multibyte regular expression match

(PHP 5 >= 5.3.0, PHP 7, PECL intl >= 1.0.0) Sort array using specified collator and sort keys

(PHP 5.5.0, PHP 7, PECL >= 3.0.0a1) Whether date/time interpretation is in lenient mode

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

(PHP 7) Get the property constant value for a given property name

(PHP 5, PHP 7) Returns an array of all supported encodings

(PHP 5 >= 5.3.0, PHP 7, PECL enchant >= 0.1.0 ) Declares a preference of dictionaries to use for the language