What are the risks associated with rewriting variables in PHP?

Rewriting variables in PHP can lead to unintended consequences such as overwriting important data or causing unexpected behavior in your code. To avoid these risks, it's best practice to use unique variable names and avoid reassigning values to variables that are already in use.

// Example of using unique variable names to avoid rewriting
$originalVariable = "Hello";
$newVariable = $originalVariable . " World!";
echo $newVariable;