How can PHP developers ensure that variable changes in one block of code do not affect variables in another block?

To ensure that variable changes in one block of code do not affect variables in another block, PHP developers can use functions to encapsulate variables within a specific scope. By defining variables within a function, they are limited to that function's scope and cannot be accessed or modified outside of it. This helps prevent unintended variable changes and keeps code more organized and maintainable. 

function myFunction() {
    $variable = 'Hello';
    echo $variable; // Output: Hello
}

$variable = 'World';
echo $variable; // Output: World

myFunction();

Keywords

variable scope global keyword local variables namespaces function parameters

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