static-variables

I have three files - global.php, test.php , test1.php Global.php $filename; $filename = "test"; test.php $filename = "myfile.jpg"; echo $filename; test1.php echo $filename; I can read this variable from both test and test1 files by include 'global.php'; Now i want to set the value of $filename in test.php and the same value i want to read in test1.php. I tried with session variables as well but due to two different files i am not able to capture the variable. How to achieve this........ Thanks for help in advance..... Use: global.php <?php if(!session_id()) session_start(); $filename = "test";

Does anyone know why a library initialized within dlopen() would initialize a static variable owned by the main program. Both the main program and shared library have a copy of the static variable, but for some reason the shared library re-initializes the main program's copy of the static variable and destructs it, causing a segfault when the main program attempts to destruct it. Is this a case of bad name mangling in the symbol table? This is a case where the runtime linker only wants a single active copy of a symbol in a process. If both a shared object and the executable have a copy of the

Isn't it unnecessary to retain a static variable since it stays around for the duration of the program, no matter if you release it? See this code: https://github.com/magicalpanda/MagicalRecord/blob/master/Source/Categories/NSManagedObjectContext+MagicalRecord.m#L24-29 I'm assuming you mean a static object pointer, such as static NSString *foobar; . Such variables indeed have a lifetime as long as the application, but the variables we're talking about are pointers only . In Objective-C, objects are always dynamically allocated, and so we always address them with a pointer to their type, but

I don't quite understand static variables when defined in the implementation of an interface. In methods I do understand how they differ from local variables, but not when defined directly in an implementation. Look at these examples. What difference do these two make practically? #include "MyClass.h" @implementation MyClass int myInt; ... @end And: #include "MyClass.h" @implementation MyClass static int myInt; ... @end myInt is in both cases visible to all the methods, and if I interpreted a test I ran correctly, myInt will in both cases be the same variable for different instances of the

Can we declare Static Variables inside Main method? Because I am getting an error message: Illegal Start of Expression Roman 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. You can use static variables inside your main method (or any other method), but you need to declare them in the class: This is totally fine: public Class YourClass { static int someNumber = 5; public

I have a function in R that I call multiple times. I want to keep track of the number of times that I've called it and use that to make decisions on what to do inside of the function. Here's what I have right now: f = function( x ) { count <<- count + 1 return( mean(x) ) } count = 1 numbers = rnorm( n = 100, mean = 0, sd = 1 ) for ( x in seq(1,100) ) { mean = f( numbers ) print( count ) } I don't like that I have to declare the variable count outside the scope of the function. In C or C++ I could just make a static variable. Can I do a similar thing in the R programming language? Here's one