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

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

(PHP 4, PHP 5, PHP 7) Repeat a string string

(PHP 4, PHP 5, PHP 7) Replace text within a portion of a string

(PHP 4 >= 4.1.0, PHP 5, PHP 7) Output a formatted string

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

(PHP 4, PHP 5, PHP 7) Find length of initial segment not matching mask

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

(PHP 4, PHP 5, PHP 7) Parses the string into variables

(PHP 5, PHP 7) Case-insensitive version of