October 2006
Intermediate to advanced
720 pages
17h 56m
English
Content preview from Oracle Database 10g Express Edition PHP Web Programming
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Understanding Variable Scope in Functions
PHP functions work differently than many other programming languages because they are globally defined. Likewise, the rules of scope may appear different than the norm, but they are not.
Functions can access only global variables and variables defined in them, which are known as local variables. You define global variables with the define() function that was discussed in Chapter 4. Global variables can be defined inside functions, which make them available only after calling the containing function. This behavior has benefits and problems. The benefit is that you can define conditional global variables at run time. The problem is that you can have more than one mechanism that returns values from a function, ...
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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.