I

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%i format string option (DATE FORMAT() function)
%i formatting directive
icons
     padlock
     Service
identical operators (===)
identifiers (directive), status codes
IdentityCheck directive, conditional logging
IDs (session), passing in query strings
if statements 2nd 3rd
if, else statements
<IfDefine> conditional container
<IfDefine SSL> block, SSL directives
ImageArc() function
ImageColorAllocate() function
ImageCreate() function
ImageCreateFromGif() function
ImageCreateFromJpg() function
ImageCreateFromPng() function
ImageDestroy() function
ImageEllipse() function
ImageFilledArc() function 2nd
ImageFilledEllipse() function
ImageFilledPolygon() function
ImageFilledRectangle() function
ImageGif() function
ImageJpeg() function
ImageLine() function
imageloadfont() function
ImagePng() function
ImagePolygon() function
ImageRectangle() function
images
    creating
         JPEG libraries
         PHP distribution
         PNG libraries
         RGB color values
         user input
         zlib libraries
    drawing
         color fills
         existing images
         ImageColorAllocate() function
         ImageCreate() function
         lines
         pie charts
         shapes
         transparent images
         x-xis coordinates
         y-axis coordinates
     logging
     reduced transmitted data (Apache performance)
     stacking
imagestring() function 2nd
imagettftext() function
in field
include once() function
include path directive
include() function
     example listing
     executing PHP/assign return values
     files
     include once() function
     include path directive
     included documents, returning values from
     loops
     within control structures
incrementing integer variables
INDEX command
index strings
indexes, directive value
infinite loops
inheritance (objects)
input forms/scripts
     discussion forums, creating for
     receiving
INSERT command 2nd 3rd
Insert Record button
INSERT statement
INSTALL file
installing
    Apache
         binary installs
         current and future versions
         Linux/Unix installs 2nd
         Mac OS X installs
         methods for, selecting
         source code installs
         Windows installs 2nd
    MySQL
         current and future version information
         Linux/Unix installs 2nd
         Mac OS X installs 2nd
         troubleshooting
         Windows installs 2nd 3rd
    OpenSSL library
         SSL installs
         UNIX installs
         Windows installs
    PHP
         current and future versions
         help for
         Linux/Unix installs 2nd 3rd
         Mac OS X installs 2nd
         testing
         Windows installs 2nd 3rd
    SSL (Secure Sockets Layer)
         mod ssl module
         OpenSSL library
instruction terminator
INT data type
integer data type
integer variables, incrementing/decrementing
integrating PHP with Apache
     Linux
     Unix
     Windows
integrity
     communications, security
     message digests
internationalization
    environment modifications
         Apache, configuration changes to
         MySQL, configuration changes to
         PHP, configuration changes to
     key aspects
IP addresses
     control access rules
     reverse DNS lookups
IP-based virtual hosting
irreversible message digests
is uploaded file() function
is_dir() function
is_executable() function
is_file() function 2nd
is_readable() function
is_writable() function
isset() function
issuer information (certificates)
iterations (loops) 2nd