ASCII.(1) - phpMan

a64l (3p)            - convert between a 32-bit integer and a radix-64 ASCII ...
ascii (7)            - ASCII character set encoded in octal, decimal, and hex...
encoding (3pm)       - allows you to write your script in non-ascii or non-utf8
gneqn (1)            - format equations for ascii output
hexdump (1)          - display file contents in ascii, decimal, hexadecimal, ...
isascii (3p)         - test for a 7-bit US-ASCII character
l64a (3p)            - convert between a 32-bit integer and a radix-64 ASCII ...
neqn (1)             - format equations for ascii output
pod2text (1)         - Convert POD data to formatted ASCII text
Pod::Text (3pm)      - Convert POD data to formatted ASCII text
Pod::Text::Color (3pm) - Convert POD data to formatted color ASCII text
Pod::Text::Termcap (3pm) - Convert POD data to ASCII text with format escapes
strtod (3)           - convert ASCII string to floating-point number
strtof (3)           - convert ASCII string to floating-point number
strtold (3)          - convert ASCII string to floating-point number
toascii (3p)         - translate an integer to a 7-bit ASCII character
utf-8 (7)            - an ASCII compatible multibyte Unicode encoding
utf8 (7)             - an ASCII compatible multibyte Unicode encoding