(PHP 4, PHP 5, PHP 7) Find the last occurrence of a character in a string

(PHP 4, PHP 5, PHP 7) Perform a global regular expression match

(PHP 4, PHP 5) Case insensitive regular expression match

(PHP 4, PHP 5, PHP 7) Perform a regular expression match

(PHP 4, PHP 5, PHP 7) Find the position of the last occurrence of a substring in a string

(PHP 5 >= 5.3.0, PHP 7) Convert a 8 bit string to a quoted-printable string

(PHP 4, PHP 5, PHP 7) Return information about characters used in a string

(PECL bbcode >= 0.9.0) Parse a string following a given rule set

(PHP 4, PHP 5, PHP 7) Binary safe case-insensitive string comparison

(PHP 4, PHP 5, PHP 7) Find the first occurrence of a string