Global variables can be accessed from anywhere in a JavaScript program. Variables declared with var, let and const are quite similar when declared outside a block.

JavaScript Data Types JavaScript variables can hold numbers like 100 and text values like "John Doe". In programming, text values are called text strings. JavaScript can handle many types of data, but for now, just think of numbers and strings. Strings are written inside double or single quotes. Numbers are written without quotes.

Normally, when you create a variable inside a function, that variable is local, and can only be used inside that function. To create a global variable inside a function, you can use the global assignment operator <<-

Normally, when you create a variable inside a function, that variable is local, and can only be used inside that function. To create a global variable inside a function, you can use the global keyword.

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All variables used in a function should be declared as local variables. Local variables must be declared with the var, the let, or the const keyword, otherwise they will become global variables.

If you assign a value to a variable that has not been declared, it will automatically become a GLOBAL variable:

A variable created in the main body of the Python code is a global variable and belongs to the global scope. Global variables are available from within any scope, global and local.

JavaScript variables can belong to: The local scope or The global scope Global variables can be made local (private) with closures. Closures makes it possible for a function to have "private" variables.

PHP Variables Scope In PHP, variables can be declared anywhere in the script. The scope of a variable is the part of the script where the variable can be referenced/used. PHP has three different variable scopes: local global static