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\r special character 
radio buttons, setting default values in 
Ray, Erik T.  2nd 
rb and rb+ modes for fopen( ) 
read permission, testing for 
reading
    entire files 
    parts of files 
realpath( ) 
register_globals configuration directive 
regular expressions 
    anchors and 
    character classes and 
    characters and metacharacters 
    email addresses, verifying with 
    grouping together characters 
    PCRE extension functions 
    quantifiers and 
        greedy/nongreedy 
    screen scraping and 
    validation strategies and 
remote files
    reading 
    writing 
REMOTE_ADDR element in $_SERVER auto-global array 
REMOTE_HOST element in $_SERVER auto-global array 
replacing matching parts of strings 
require construct 
required elements in forms, checking length of 
resources, PHP 
response body in HTML documents 
return keyword 
return values  2nd 
    assigning to variables 
    capturing 
    passing to other functions 
return values of functions 
reverse-sorting functions for arrays 
rows 
    adding to database tables 
    affectedRows( ) 
    alternating colors of 
    counting, using numrows( ) 
    fetchRow( ) 
    removing from tables 
    retrieved
        changing format of 
        as objects 
    returned from SELECT query, ordering 
    uniquely identifying in tables 
    updating all or some 
rsort( ) 
RSS (XML format)
    extending DomDocument to handle RSS feed 
    generating XML documents 
    parsing XML documents 

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