(PHP 4, PHP 5, PHP 7) Case insensitive string comparisons using a "natural order" algorithm

(PHP 4, PHP 5, PHP 7) Join array elements with a string

(PHP 4, PHP 5, PHP 7) Translate characters or replace substrings

(PHP 4, PHP 5, PHP 7) Calculate the similarity between two strings

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

(PHP 5, PHP 7) Find the position of the first occurrence of a case-insensitive substring in a string

(PHP 4, PHP 5, PHP 7) Output one or more strings

(PHP 5, PHP 7) Uuencode a string string convert_uuencode

(PHP 4 >= 4.0.1, PHP 5, PHP 7) Parses input from a string according to a format

(PHP 4, PHP 5, PHP 7) Perform a regular expression search and replace