> On May 29, 2018, at 1:25 PM, John <john.iliffe@xxxxxxxxx> wrote: > > On Tue, 2018-05-29 at 22:06 +0200, Christoph M. Becker wrote: >> On 29.05.2018 at 16:18, John wrote: >> >>> Thanks for your reply Christoph. From your and other comments it appears >>> that I >>> can't do what I was trying to do. >>> >>> On the one hand, it is satisfying that I wasn't making a mistake; on the >>> other, >>> I sure wish there was a way to avoid passing all these variables in PHP! In >>> a >>> way it makes the "function" command far less valuable than it should be! >> >> On the contrary, I'd say! If I see a variable inside a function body, I >> almost immediately know that it is a local variable or a function >> parameter (or a superglobal), unless there is a global “declaration”. >> Even better, each time I add a global “declaration”, I'm reminded to >> think of a better way to express myself, and if I see a lengthy list of >> globals, I know that the code will be hard to maintain. See also >> <http://wiki.c2.com/?GlobalVariablesAreBad>. >> > Well, it's certainly one point of view, and I don't disagree with most of it. > > On the other hand, I would assume that the word "global" really means global, > that is, in scope to the entire script, and I think most programming languages > with which I have worked follow this convention. > > It is necessary to be aware of the programme structure and define variables in > the proper scope - if the variable is local, then define it in local scope, if > it is required throughout the script or programme, then put it in global scope. > > The reference you gave mentions that conflicts could occur with variable names > within a a function but I think this would simply hide the conflicting global > (but I confess to being unsure about that in PHP). > > For full disclosure here, I am not a programmer and never have been; simply run > a web site for a small publishing company and I am the sysadmin, web designer, > operator, network specialist and you name it. I worked in IT in operations for > many years on IBM mainframes before I retired; I'm in my late 70's now and all > this is simply to keep me out of trouble! There's nothing on earth more > terrifying that a bored retiree with time on his hands. > > Thanks again. > > John Hi again; We have some things in common, but not including employment. I am a developer who does this for a hobby and to maintain my own portfolio site and another for a stained glass artist friend. This may be off, but as I understand it, in c programming, if you compile a separate source file with its own globals, those globals aren’t necessarily global to the whole program in which the compiled source file is included. But what I do when I have a lot of otherwise globals, as in procedural code, I create as class definition and create private static variable for reference. These variables can be initiated and/or configured with the use of a constructor function inside the class definition. The idea is that global variables are exposed to all sorts of scripts and functions and can be altered or used by functions and code that shouldn’t be using and/or altering them. But, I have been programming self processing html/php files that present and manage user interface elements. So one class definition can be used to service all requests, for the most part. The class definition, can in turn, include or require other script files to supplement. These supplemental files can contain “global” variable definitions with default initialization. These cannot be altered accept through brute force rewrite of the script file they are defined in. http://php.net/manual/en/book.classobj.php I hope this is useful. Jeff K -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
