Use: global.php <?php if(!session_id()) session_start(); $filename = “test”; if(!isset($_SESSION[‘filename’])) { $_SESSION[‘filename’] = $filename; } ?> test.php <?php if(!session_id()) session_start(); //include(“global.php”); $_SESSION[‘filename’] = “new value”; ?> test1.php <?php if(!session_id()) session_start(); $filename = $_SESSION[‘filename’]; echo $filename; //output new value ?>
Obviously, no, we can’t. In Java, static means that it’s a variable/method of a class, it belongs to the whole class but not to one of its certain objects. This means that static keyword can be used only in a ‘class scope’ i.e. it doesn’t have any sense inside methods.
In your recursion call printf() executes when main() returns. And because var is a static variable its value remain 0 (last value = 0 same for all function call) Note if() condition false when var becomes 0 (last value, after main(); call you don’t change var – notice diagram). Hope following diagram will help you … Read more
Instead of bar use self.bar or Foo.bar. Assigning to Foo.bar will create a static variable, and assigning to self.bar will create an instance variable.
Instead of bar use self.bar or Foo.bar. Assigning to Foo.bar will create a static variable, and assigning to self.bar will create an instance variable.
gcc 4.4 will give you warning. In the later versions of gcc this feature (-Wunreachable-code) has been removed. See here: http://gcc.gnu.org/ml/gcc-help/2011-05/msg00360.html The -Wunreachable-code has been removed, because it was unstable: it relied on the optimizer, and so different versions of gcc would warn about different code. The compiler still accepts and ignores the command line … Read more
Well, if you can modify file a.c then just make val non-static. If you can modify a.c but can’t make val non-static (why?), then you can just declare a global pointer to it in a.c int *pval = &val; and in b.c do extern int *pval; which will let you access the current value of … Read more
Yes, it does normally translate into an implicit if statement with an internal boolean flag. So, in the most basic implementation your declaration normally translates into something like void go( int x ) { static int j; static bool j_initialized; if (!j_initialized) { j = x; j_initialized = true; } … } On top of … Read more
Your description of a static variable is more fitting to that found in C. The concept of a static variable in Object Oriented terms is conceptually different. I’m drawing from Java experience here. Static methods and fields are useful when they conceptually don’t belong to an instance of something. Consider a Math class that contains … Read more
In the context of class attributes, static has a different meaning. If you have a field like: private static int sharedAttribute; then, each and every instance of the class will share the same variable, so that if you change it in one instance, the change will reflect in all instances, created either before or after … Read more