(PHP 4, PHP 5, PHP 7) Quote string with slashes in a C style

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

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

(PHP 4, PHP 5, PHP 7) Calculate the soundex key of a string

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Perform the rot13 transform on a string

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

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Calculates the md5 hash of a given file

(PHP 4, PHP 5, PHP 7) Make a string uppercase

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

(PHP 4, PHP 5, PHP 7) Binary safe string comparison of the first n characters