RE: [PHP] What does register_globals do?
From: Matt Babineau [mailto:[EMAIL PROTECTED]] Sent: Monday, July 22, 2002 3:59 PM Subject: [PHP] What does register_globals do? I have never had a clear understanding about what this does, the php.ini has an explanation but being newer to PHP I don't understand it very well. Could someone prodive a human explanation about what register_globals does and why it is so important? Register globals makes it *really* easy to code in php. It's what takes the uri or posted form data, and turns them into global variables in your script. So if a url looked like: http://www.fakename.com/index.php?target=help and with register-globals on, php will create a variable, $target, which has the value 'help' in it. It's very useful and friendly but, if you don't initialize your variables then some non-so-nice person could initialize them for you by passing them on the uri/post/cookie/etc so that your code no longer works as expected. You're safe with it on if you always initialize variables, and set error_reporting to E_ALL while testing so you catch any you might otherwise miss. If you leave it off, you need to use the associative arrays $_POST, $_GET etc. The above example would be $_GET['target']. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] What does register_globals do?
My way of thinking about is: With register_globals ON, all variables defined are available anywhere in the script (with the exception of functions and classes, unless defined otherwise), whereas with register_globals OFF, they are only available through the superglobals for the respective variable types. I'm sure there's a much better way to explain it, but it works for me :o) Martin Clifford Homepage: http://www.completesource.net Developer's Forums: http://www.completesource.net/forums/ Matt Babineau [EMAIL PROTECTED] 07/22/02 03:59PM I have never had a clear understanding about what this does, the php.ini has an explanation but being newer to PHP I don't understand it very well. Could someone prodive a human explanation about what register_globals does and why it is so important? Matt Babineau MCWD / CCFD - e: mailto:[EMAIL PROTECTED] [EMAIL PROTECTED] p: 603.943.4237 w: http://www.criticalcode.com/ http://www.criticalcode.com PO BOX 601 Manchester, NH 03105 -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] What does register_globals do?
From: Martin Clifford [mailto:[EMAIL PROTECTED]]
Sent: Monday, July 22, 2002 4:21 PM
Subject: Re: [PHP] What does register_globals do?
My way of thinking about is:
With register_globals ON, all variables defined are available
anywhere in the script (with the exception of functions and
classes, unless defined otherwise), whereas with
register_globals OFF, they are only available through the
superglobals for the respective variable types.
That's not quite right. Php's variable scoping is different than most langauges.
Variables inside a function are always local, even with register_globals on (this has
something to do with Rasmus' life experiences at IBM). So you would need to use global
on a variable inside a function (unless it's passed in) and except for the 'magic'
global arrays, $_POST, $_GET, $_COOKIE, $_SERVER, etc
--- register_globals on --
http://localhost/index.php?target=help
?php
function echo_out() {
global $target;
echo $targetbr;
}
echo_out();
?
--- register_globals off --
http://localhost/index.php?target=help
?php
function echo_out() {
echo {$_GET['target']}br;
}
echo_out();
?
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RE: [PHP] What does register_globals do?
unless defined otherwise was what I said. When I said that, I simply meant that you
declare the variables as global within the function and/or class.
Martin Clifford
Homepage: http://www.completesource.net
Developer's Forums: http://www.completesource.net/forums/
Matt Schroebel [EMAIL PROTECTED] 07/22/02 04:41PM
From: Martin Clifford [mailto:[EMAIL PROTECTED]]
Sent: Monday, July 22, 2002 4:21 PM
Subject: Re: [PHP] What does register_globals do?
My way of thinking about is:
With register_globals ON, all variables defined are available
anywhere in the script (with the exception of functions and
classes, unless defined otherwise), whereas with
register_globals OFF, they are only available through the
superglobals for the respective variable types.
That's not quite right. Php's variable scoping is different than most langauges.
Variables inside a function are always local, even with register_globals on (this has
something to do with Rasmus' life experiences at IBM). So you would need to use global
on a variable inside a function (unless it's passed in) and except for the 'magic'
global arrays, $_POST, $_GET, $_COOKIE, $_SERVER, etc
--- register_globals on --
http://localhost/index.php?target=help
?php
function echo_out() {
global $target;
echo $targetbr;
}
echo_out();
?
--- register_globals off --
http://localhost/index.php?target=help
?php
function echo_out() {
echo {$_GET['target']}br;
}
echo_out();
?
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