How does the use of global variables in PHP functions impact the overall functionality and security of the code?

Using global variables in PHP functions can impact the overall functionality and security of the code by making it harder to track variable changes and potentially leading to unexpected behavior. It is generally recommended to avoid using global variables in functions and instead pass variables as parameters to the function. 

// Avoid using global variables in functions
$globalVar = 10;

function myFunction() {
    global $globalVar;
    // Code that uses $globalVar
}

// Instead, pass variables as parameters
$globalVar = 10;

function myFunction($globalVar) {
    // Code that uses $globalVar
}

Keywords

global variables PHP functions functionality security code

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