How does PHP handle the lifespan of objects created within a script, especially in the context of multiple users submitting form data simultaneously?

PHP uses a garbage collection mechanism to manage the lifespan of objects created within a script. This means that objects will be automatically destroyed when they are no longer in use or when the script finishes executing. To ensure that objects are properly managed, it is important to unset variables or objects that are no longer needed.

// Example of unsetting variables after they are no longer needed
$variable1 = "data";
unset($variable1);