FILE_BASENAME - Returns the basename of a file path.
FILE_DIRNAME - Returns the dirname of a file path.
I18N_MULTIBYTETOUTF8 - Converts multibyte to UTF8.
I18N_MULTIBYTETOWIDECHAR - Converts multibyte to UTF-16, wide-character (Unicode).
I18N_UTF8TOMULTIBYTE - Converts UTF-8 to multibyte .
I18N_WIDECHARTOMULTIBYTE - Converts UTF-16, wide-character (Unicode) to multibyte.
IDL_BASE64 - Converts between byte arrays and MIME Base64 encoded scalar strings.
STRCMP - Compares two strings.
STRCOMPRESS - Removes whitespace from a string.
STREGEX - Performs regular expression matching.
STRING - Converts arguments to string type.
STRJOIN - Collapses a string scalar or array into merged strings.
STRLEN - Returns the length of a string.
STRLOWCASE - Converts a string to lower case.
STRMATCH - Compares search string against input string expression.
STRMID - Extracts a substring from a string.
STRPOS - Finds first occurrence of a substring within a string.
STRPUT - Inserts the contents of one string into another.
STRSPLIT - Splits its input string argument into separate substrings, according to the specified pattern.
STRTRIM - Removes leading and/or trailing blanks from string.
STRUPCASE - Converts a string to upper case.