What is the relationship between milliseconds and seconds in PHP?

In PHP, milliseconds are a smaller unit of time than seconds, with 1 second being equal to 1000 milliseconds. To convert milliseconds to seconds, you can divide the milliseconds by 1000. Similarly, to convert seconds to milliseconds, you can multiply the seconds by 1000.

// Convert milliseconds to seconds
$milliseconds = 500;
$seconds = $milliseconds / 1000;

echo $seconds; // Output: 0.5

// Convert seconds to milliseconds
$seconds = 2;
$milliseconds = $seconds * 1000;

echo $milliseconds; // Output: 2000