How can one effectively use the global keyword in PHP to access variables outside of a function scope?

When you want to access variables defined outside of a function within the function scope in PHP, you can use the `global` keyword. This keyword allows you to specify that a variable is from the global scope, rather than creating a new local variable with the same name. By using `global`, you can modify the global variable's value from within the function. 

$globalVar = 10;

function updateGlobalVar() {
    global $globalVar;
    $globalVar = 20;
}

updateGlobalVar();
echo $globalVar; // Output will be 20

Keywords

global keyword PHP variables function scope access

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