1) you’re specifying its linkage. extern linkage allows you or any client to reference the symbol. regarding global variables: if the variable is mutable and/or needs proper construction, then you should consider methods or functions for this object. the notable exception to this is NSString constants: // MONClass.h extern NSString* const MONClassDidCompleteRenderNotification; // MONClass.m NSString* … Read more
A. Use the global keyword to import from the application scope. $var = “01-01-10”; function checkdate(){ global $var; if(“Condition”){ $var = “01-01-11”; } } checkdate(); B. Use the $GLOBALS array. $var = “01-01-10”; function checkdate(){ if(“Condition”){ $GLOBALS[‘var’] = “01-01-11”; } } checkdate(); C. Pass the variable by reference. $var = “01-01-10”; function checkdate(&$funcVar){ if(“Condition”){ $funcVar … Read more
If you want your function to always be available, without including it, do this: Create your function in a PHP file. In your php.ini file, search for the option auto_prepend_file and add your PHP file to that line, like this: `auto_prepend_file = “/path/to/my_superglobal_function.php”` Or if you write it with a non absolute path, like this: … Read more
By declaring it global inside the function that accesses it: g_c = 0 class TestClass(): def run(self): global g_c for i in range(10): g_c = 1 print(g_c) The Python documentation says this, about the global statement: The global statement is a declaration which holds for the entire current code block.
It’s not possible to set user-level variables within a plain php.ini file (or the .htaccess equivilents). There are some PECL modules that do allow that, such as hidef (http://pecl.php.net/package/hidef) – though these would need to be installed on every installation you use. Including (or pre-including) a file with auto_prepend_file is quite possible – though that … Read more
Well, you should only use globals in limited circumstances, but to answer your question: global is potentially marginally faster (it will rarely make a difference). $GLOBALS (not $GLOBAL) is more readable, because every time you see it, you know you are accessing/changing a global variable. This can be crucial in avoiding nasty bugs. Inside the … Read more
Static is a keyword with many meanings, and in this particular case, it means not global (paraphrasing) It means that each .cpp file has its own copy of the variable. Thus, when you initialize in main.cpp, it is initialized ONLY in main.cpp. The other files have it still uninitialized. First thing to fix this would … Read more
Python gives the programmer a large number of tools for introspecting the running environment. globals() is just one of those, and it can be very useful in a debugging session to see what objects the global scope actually contains. The rationale behind it, I’m sure, is the same as that of using locals() to see … Read more
How do I share global variables across modules? The canonical way to share information across modules within a single program is to create a special module (often called config or cfg). Just import the config module in all modules of your application; the module then becomes available as a global name. Because there is only … Read more
Solution One way to do this is to create a class and use its instance, this way you can not only access the object of the class within a controller, blade, or any other class as well. AppHelper file In you app folder create a folder named Helpers and within it create a file name … Read more