May 2003
Intermediate to advanced
592 pages
14h 28m
English
Content preview from PHP and MySQL for Dynamic Web Sites: Visual QuickPro Guide
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Variable Scope
Variable scope is a tricky but important concept. Every variable in PHP has a scope to it, which is to say a realm in which the variable (and therefore its value) can be accessed. As a rule of thumb, every variable has the scope of the page in which it resides. In other words, you can refer to a variable anywhere within a script once you’ve defined it (set its value). Assuming your PHP configuration has register_globals turned on, your form values can be accessed anywhere within the handling page.
Since included files act as if they were part of the original (including) script, variables defined before the include line are available to the included file. Further, variables defined within the included file are available to the ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.