How can PHP developers effectively debug and troubleshoot scripts that exhibit unexpected behavior, such as continuing to run after the script file has been deleted?

When a PHP script continues to run after the script file has been deleted, it may be due to the script being already loaded into memory. To troubleshoot this, you can restart the PHP server or clear the opcode cache to force the script to stop running.

// Clear opcode cache to stop the script from running
opcache_reset();