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

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

(PHP 5, PHP 7) Write a formatted string to a stream

(PHP 4 >= 4.0.2, PHP 5, PHP 7) Wraps a string to a given number of characters

(PHP 4, PHP 5, PHP 7) Set locale information

(PHP 4, PHP 5, PHP 7) Convert from one Cyrillic character set to another

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

(PHP 4, PHP 5, PHP 7) Alias of

(PHP 5, PHP 7) Decode a uuencoded string string

(PHP 4, PHP 5, PHP 7) Make a string's first character uppercase