How can the use of sleep() or usleep() functions help reduce CPU usage in PHP scripts?

Using the sleep() or usleep() functions in PHP scripts can help reduce CPU usage by introducing pauses in the script execution, allowing the CPU to handle other tasks in the meantime. This can be particularly useful in situations where a script is performing repetitive tasks or waiting for external resources.

// Example of using sleep() to reduce CPU usage
while(true){
    // Perform some tasks
    sleep(1); // Pause execution for 1 second
}