I

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icons used in this book
if statement
implicit casting, operators
include files
include statement
     include_once
     require
     require_once
increment operators, PHP
indenting
indexes
     multicolumn
infinite loops
inheritance, classes
     extends operator
     parent operator
insert command
installation
     Apache
     local development
     MySQL
     PEAR
         Unix
         Windows
     PHP
     remote login and
     Smarty
Installation Wizard, Apache
instances
is_exectuable function
is_readable function
is_writable function