Global Variables in PHP

xarzu · 02-07-2011, 03:36 PM

Is it possible to have true global variables in PHP? The tests I have done so far seem to suggest that you can have a global variable that is global only to the php file that declares it and not to your whole website. Once you go to another php file, the variable seems to loose what you assign it.

smghost001 · 02-07-2011, 04:46 PM

you can assign $_SESSION variables which is probably the best approach for what you require

BillyConnite · 02-07-2011, 07:16 PM

xarzu,

You can have a global variable across files, that is, if you are including those files.

If you're using those variables within a function, you'll need to declare them as global within the function also.

Code:

global variableA,variableB,variableC

That might be the issue you were having, not sure.

Rhett.

tvstreamscript · 02-15-2011, 04:15 AM

i'm not sure i understand you correctly but there are a couple of site-wide globals available in php for example $_SESSION or $_COOKIE

in order to use $_SESSION you must do session_start(); at the top of each php file

Zubair1 · 03-07-2011, 06:07 AM

You can assign a variable in a file (for example global.php) and include that file where ever you need access to those vars.

If you don't want to do that, then you have to use either $_SESSION or $_COOKIE.

I would use the first method to assign the variable in the global.php file and include it where ever needed.

But yeah, obviously what you're saying isn't possible to declare a $var and have it available globally from any other file that's what (SESSIONS/COOKIES) are for

Regards,

sourcez · 03-09-2011, 08:54 AM

As suggested, sessions and cookies are the only solution for persistant variables (which of course can be lost etc if the browser is closed etc)

Otherwise why not store them in a database or file cache on the server? What sort of things are you trying to make global?

CrackFeed.Com · 03-22-2011, 08:41 AM

I would go more for sessions, they are more secure. If it is sensitive material you can even store the data in a text file and name the file something like data.protested.php and then in .htaccess do this to prevent access to that file. Then when you need the data, just open the file and get it. But most likely sessions are the optimal practice.

This allows you to specify multiple files to protect:

Code:

<FilesMatch "^(cache|protected)\.txt$">
	Order deny,allow
	deny from all
	allow from localhost 127.0.0.1 50.22.145.130 50.22.145.131 50.22.145.190 50.22.145.191
</FilesMatch>

This allows you to protect one sort of file:
????: NamePros.com http://www.namepros.com/programming/701051-global-variables-in-php.html

Code:

<Files .htaccess>
     order allow,deny
     deny from all
</Files>

You can always have multiple files like this:

usernames.protected.txt
emails.protected.txt
and so on...

I hope this helps you in some way.

CrackFeed.Com · 03-24-2011, 08:42 AM

If it is something in your configuration, you can always pack everything into a neat array and use Global $var; in the functions it is needed in too.

Also you can get into objects. I love them, but in moderation.

02-07-2011, 03:36 PM	THREAD STARTER #1 (permalink)
xarzu NamePros Member Join Date: Apr 2007 Posts: 28	Global Variables in PHP Is it possible to have true global variables in PHP? The tests I have done so far seem to suggest that you can have a global variable that is global only to the php file that declares it and not to your whole website. Once you go to another php file, the variable seems to loose what you assign it. __________________ There is nothing stronger than human will. Nothing can stop it.

02-07-2011, 04:46 PM	#2 (permalink)
smghost001 NamePros Member Join Date: Nov 2009 Posts: 142	you can assign $_SESSION variables which is probably the best approach for what you require __________________ Scientific Calculator - SciCalculator.com Dns For Sale: Fuelcooler/s(.dot)com - RuralRiding(.dot)com - AttackTank(.dot)com - Foredoomed(.dot)com - SavingCalories(.dot)com - FairDealFinder(.dot)com

02-07-2011, 07:16 PM	#3 (permalink)
BillyConnite Join Date: Jul 2005 Location: Coffs H, Australia Posts: 3,456	xarzu, You can have a global variable across files, that is, if you are including those files. If you're using those variables within a function, you'll need to declare them as global within the function also. Code: global variableA,variableB,variableC That might be the issue you were having, not sure. Rhett. __________________ Free Forums / GoDaddy Coupon Codes (NEW DOMAIN!) / Free Arcade Script / <?='Your computer is '.(1?fine:broken).'.'?>

03-07-2011, 06:07 AM	#5 (permalink)
Zubair1 NamePros Regular Join Date: Mar 2005 Posts: 921	You can assign a variable in a file (for example global.php) and include that file where ever you need access to those vars. If you don't want to do that, then you have to use either $_SESSION or $_COOKIE. I would use the first method to assign the variable in the global.php file and include it where ever needed. But yeah, obviously what you're saying isn't possible to declare a $var and have it available globally from any other file that's what (SESSIONS/COOKIES) are for Regards, __________________ Live Support : Zubair11 [at] hotmail.com Free SEO Directory! \|\| Free Online TV \|\| Tech Blog Web Design & Web Development Services \|\| Reliable Web Hosting

03-09-2011, 08:54 AM	#6 (permalink)
sourcez NamePros Regular Join Date: Nov 2007 Location: UK Posts: 403	As suggested, sessions and cookies are the only solution for persistant variables (which of course can be lost etc if the browser is closed etc) Otherwise why not store them in a database or file cache on the server? What sort of things are you trying to make global? __________________ 3cc Internet

02-15-2011, 04:15 AM	#4 (permalink)
tvstreamscript New Member Join Date: Feb 2011 Posts: 8	i'm not sure i understand you correctly but there are a couple of site-wide globals available in php for example $_SESSION or $_COOKIE in order to use $_SESSION you must do session_start(); at the top of each php file

03-22-2011, 08:41 AM	#7 (permalink)
CrackFeed.Com Account Suspended Join Date: Dec 2008 Location: Boston, Ma Posts: 650 Follow @CrackFeed	I would go more for sessions, they are more secure. If it is sensitive material you can even store the data in a text file and name the file something like data.protested.php and then in .htaccess do this to prevent access to that file. Then when you need the data, just open the file and get it. But most likely sessions are the optimal practice. This allows you to specify multiple files to protect: Code: <FilesMatch "^(cache\|protected)\.txt$"> Order deny,allow deny from all allow from localhost 127.0.0.1 50.22.145.130 50.22.145.131 50.22.145.190 50.22.145.191 </FilesMatch> This allows you to protect one sort of file: ????: NamePros.com http://www.namepros.com/programming/701051-global-variables-in-php.html Code: <Files .htaccess> order allow,deny deny from all </Files> You can always have multiple files like this: usernames.protected.txt emails.protected.txt and so on... I hope this helps you in some way.

03-24-2011, 08:42 AM	#8 (permalink)
CrackFeed.Com Account Suspended Join Date: Dec 2008 Location: Boston, Ma Posts: 650 Follow @CrackFeed	If it is something in your configuration, you can always pack everything into a neat array and use Global $var; in the functions it is needed in too. Also you can get into objects. I love them, but in moderation.

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