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

(PHP 4 >= 4.0.1, PHP 5, PHP 7) Calculates the crc32 polynomial of a string

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

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

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

(PHP 4, PHP 5, PHP 7) Quote string with slashes

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

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

(PHP 4, PHP 5, PHP 7) Return ASCII value of character

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