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Re: define ('NL', "<br />"); can I define a constant var ?

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Dans son message précédent, Jørn Andersen a écrit :
>
> A question from someone relatively new to PHP:
> Why use constants at all?
> I always use variables - have I missed something?


Because variables have 'Scope':

http://php.net/manual/en/language.variables.scope.php

<?php

define('NL',"\n");
$NL = '<br />';

function sayHello() {

  echo 'Hello 2'.$NL; // $NL is not in this Scope, don't work.
  echo NL; // NL is in every Scope, works
}

sayHello();
echo 'Hello 1'.$NL;
echo NL;
?>

Constants do not have this behaivor.

If you Execute the code above you get:
-------------
Hello 2Hello 1<br />

-------------

Rgds.

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define ('NL', "<br />");  can I define a constant var ? cate <catebekensail@yahoo.com> - 2013-01-21 16:06 -0800
  Re: define ('NL', "<br />");  can I define a constant var ? Adam Harvey <usenet@adamharvey.name> - 2013-01-22 00:44 +0000
    Re: define ('NL', "<br />");  can I define a constant var ? BobMCT <r.mariotti@fdcx.net> - 2013-01-21 21:16 -0500
      Re: define ('NL', "<br />");  can I define a constant var ? Kim André Akerø <kimandre@nospambetadome.com> - 2013-01-22 03:50 +0100
  Re: define ('NL', "<br />");  can I define a constant var ? denisb <newdb@no-log.org> - 2013-01-22 08:17 +0100
  Re: define ('NL', "<br />");  can I define a constant var ? Arno Welzel <usenet@arnowelzel.de> - 2013-01-22 09:39 +0100
    Re: define ('NL', "<br />");  can I define a constant var ? Luuk <luuk@invalid.lan> - 2013-01-22 19:43 +0100
      Re: define ('NL', "<br />");  can I define a constant var ? Tim Streater <timstreater@greenbee.net> - 2013-01-22 18:58 +0000
        Re: define ('NL', "<br />");  can I define a constant var ? Luuk <luuk@invalid.lan> - 2013-01-22 20:08 +0100
          Re: define ('NL', "<br />");  can I define a constant var ? "M. Strobel" <sorry_no_mail_here@nowhere.dee> - 2013-01-23 01:35 +0100
          Re: define ('NL', "<br />");  can I define a constant var ? Arno Welzel <usenet@arnowelzel.de> - 2013-01-23 10:59 +0100
        Re: define ('NL', "<br />");  can I define a constant var ? The Natural Philosopher <tnp@invalid.invalid> - 2013-01-22 19:40 +0000
      Re: define ('NL', "<br />");  can I define a constant var ? Arno Welzel <usenet@arnowelzel.de> - 2013-01-23 10:55 +0100
    Re: define ('NL', "<br />");  can I define a constant var ? Jørn Andersen <jorn@jorna.dk> - 2013-01-22 23:51 +0100
      Re: define ('NL', "<br />");  can I define a constant var ? Shake <alex.estevezQUENO@QUENOfilnet.es> - 2013-01-23 00:08 +0100
        Re: define ('NL', "<br />");  can I define a constant var ? Jørn Andersen <jorn@jorna.dk> - 2013-01-23 00:51 +0100
          Re: define ('NL', "<br />");  can I define a constant var ? "Peter H. Coffin" <hellsop@ninehells.com> - 2013-01-22 19:03 -0600
          Re: define ('NL', "<br />");  can I define a constant var ? Shake <alex.estevezQUENO@QUENOfilnet.es> - 2013-01-23 03:42 +0100
      Re: define ('NL', "<br />");  can I define a constant var ? Jerry Stuckle <jstucklex@attglobal.net> - 2013-01-22 19:50 -0500

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