What are some common pitfalls when dealing with variable scope in PHP functions?

One common pitfall when dealing with variable scope in PHP functions is trying to access variables defined outside the function within the function's scope. To solve this, you can use the "global" keyword to explicitly declare the variable as global within the function. 

$globalVariable = 'I am a global variable';

function accessGlobalVariable() {
    global $globalVariable;
    echo $globalVariable;
}

accessGlobalVariable(); // Output: I am a global variable

Keywords

Variable scope PHP functions global variables local variables static variables

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