What are some best practices for managing long-running PHP scripts, such as setting time limits and handling memory usage?

When dealing with long-running PHP scripts, it is important to set time limits to prevent the script from running indefinitely and to handle memory usage to avoid exhausting system resources. One way to achieve this is by using the `set_time_limit()` function to restrict the execution time of the script and by monitoring memory usage using functions like `memory_get_usage()` and `memory_get_peak_usage()`.

// Set a time limit for the script to prevent it from running indefinitely
set_time_limit(60); // Set the time limit to 60 seconds

// Check memory usage periodically and handle it accordingly
if (memory_get_usage() > 1000000) {
    // If memory usage exceeds 1MB, take appropriate action
    // For example, log an error message or free up memory
}