(PHP 4, PHP 5, PHP 7) Strip whitespace (or other characters) from the end of a string

(PHP 4, PHP 5, PHP 7) Return a specific character

(PHP 4, PHP 5, PHP 7) Calculate the md5 hash of a string

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

(PHP 4 >= 4.3.0, PHP 5, PHP 7) Return information about words used in a string

(PHP 5, PHP 7) Convert a string to an array array

(PHP 4 >= 4.0.5, PHP 5, PHP 7) Locale based string comparison

(PHP 5, PHP 7) Binary safe comparison of two strings from an offset, up to length characters

(PHP 4, PHP 5, PHP 7) Return a formatted string

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