Re: A Few Noob Questions

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From	Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To	Thomas 'PointedEars' Lahn <php@PointedEars.de>
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Date	Tue, 16 Aug 2011 19:24:46 +0200
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Subject	Re: A Few Noob Questions
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Man-wai Chang wrote:

> On 16/08/11 11:02 PM, eBob.com wrote:
>> Is "script" official terminology in PHP? The book I am reading says
>> "Built-in superglobal variables are visible everywhere within a script."
>> but has never explicitly defined "script". (Although there is a hint
>> that maybe everything between tags is a script.)
> 
> In the old days, "Programs" were compiled into binary codes for direct
> execution by the CPU. "Scripts" were not compiled, but interpreted by a
> program called intepreter.

Contrary to popular belief, scripts, i. e. programs written in a scripting 
language, are compiled, too.  They are *JIT-compiled* *at runtime*.

PHP 4+ scripts are compiled by the Zend Engine (a virtual machine, currently 
Zend Engine II), to Zend Opcode, a platform-independent byte code (much like 
with Java).  That byte code is interpreted by that VM.

See also:

- <http://php.net/manual/en/internals2.opcodes.php>
- <http://www.infoworld.com/d/developer-world/zend-hails-php-microsoft-
ibm-733>.

PointedEars
-- 
Danny Goodman's books are out of date and teach practices that are
positively harmful for cross-browser scripting.
 -- Richard Cornford, cljs, <cife6q$253$1$8300dec7@news.demon.co.uk> (2004)

Thread

A Few Noob Questions "eBob.com" <eBob.com@totallybogus.com> - 2011-08-16 11:02 -0400
  Re: A Few Noob Questions A.Reader <anonymously@example.com> - 2011-08-16 11:11 -0400
    Re: A Few Noob Questions The Natural Philosopher <tnp@invalid.invalid> - 2011-08-16 16:35 +0100
  Re: A Few Noob Questions Tim Streater <timstreater@greenbee.net> - 2011-08-16 17:03 +0100
  Re: A Few Noob Questions Man-wai Chang <toylet.toylet@gmail.com> - 2011-08-17 00:35 +0800
    Re: A Few Noob Questions Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-08-16 19:24 +0200
      Re: A Few Noob Questions The Natural Philosopher <tnp@invalid.invalid> - 2011-08-16 23:58 +0100
        Re: A Few Noob Questions Man-wai Chang <toylet.toylet@gmail.com> - 2011-08-19 00:41 +0800
          Re: A Few Noob Questions The Natural Philosopher <tnp@invalid.invalid> - 2011-08-18 18:33 +0100
          Re: A Few Noob Questions Tim Streater <timstreater@greenbee.net> - 2011-08-18 18:39 +0100
            Re: A Few Noob Questions The Natural Philosopher <tnp@invalid.invalid> - 2011-08-18 19:09 +0100
      Re: A Few Noob Questions Man-wai Chang <toylet.toylet@gmail.com> - 2011-08-19 00:40 +0800
        Re: A Few Noob Questions The Natural Philosopher <tnp@invalid.invalid> - 2011-08-18 18:26 +0100
        Re: A Few Noob Questions A.Reader <anonymously@example.com> - 2011-08-18 13:44 -0400
        Re: A Few Noob Questions Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-08-20 19:48 +0200
          Re: A Few Noob Questions Samuel Smythe <s.smythe@yahoo.com> - 2011-08-20 15:08 -0400
            Re: A Few Noob Questions Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-08-20 23:31 +0200
              Re: A Few Noob Questions Samuel Smythe <s.smythe@yahoo.com> - 2011-08-20 18:37 -0400
                Re: A Few Noob Questions Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-08-21 00:41 +0200
                Re: A Few Noob Questions Samuel Smythe <s.smythe@yahoo.com> - 2011-08-20 19:04 -0400
                Re: A Few Noob Questions Jerry Stuckle <jstucklex@attglobal.net> - 2011-08-20 21:44 -0400
                Re: A Few Noob Questions Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-08-21 09:16 +0200
        Re: A Few Noob Questions Jerry Stuckle <jstucklex@attglobal.net> - 2011-08-20 15:52 -0400
  Re: A Few Noob Questions Denis McMahon <denis.m.f.mcmahon@gmail.com> - 2011-08-16 21:30 +0000
    Re: A Few Noob Questions "eBob.com" <eBob.com@totallybogus.com> - 2011-08-16 20:31 -0400
      Re: A Few Noob Questions A.Reader <anonymously@example.com> - 2011-08-17 05:50 -0400
        Re: A Few Noob Questions "eBob.com" <eBob.com@totallybogus.com> - 2011-08-18 10:12 -0400

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