In what scenarios might rearranging the code be necessary to ensure proper variable usage in PHP?

In PHP, rearranging the code might be necessary to ensure proper variable usage when variables are being used before they are defined. This can lead to errors or unexpected behavior. To solve this issue, make sure to define variables before using them in the code.

// Incorrect code with variable being used before defined
echo $name;
$name = "John";

// Corrected code with variable defined before use
$name = "John";
echo $name;