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Jump to: Introducing PHP   History      Background      Early versions of PHP      Current release      Upgrading from PHP 3      Upgrading from PHP 4      The creators of PHP      The Zend Relationship   Advantages of PHP      The HTML relationship      Interpreting vs. Compiling      Output Control      Performance      Competing Languages      When to use PHP      When not to use PHP      Selling PHP to your boss   Extending PHP   PEAR   Running PHP scripts   How PHP is written      Whitespace      Escape sequences      Heredoc      Brief introduction to variable types      Code blocks      Opening and closing code islands      Comments      Conditional statements      Case switching      Loops      Infinite loops      Special loop keywords      Loops within loops      Mixed-mode processing      Including other files   Abnormal script termination   Editing your PHP configuration   Summary   Exercises   Further reading   Next chapter

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