What is the difference between a UNIX timestamp and a MySQL timestamp in PHP?

A UNIX timestamp is a numeric value representing the number of seconds that have elapsed since the Unix epoch (January 1, 1970). On the other hand, a MySQL timestamp is a date and time format used specifically in MySQL databases. When working with timestamps in PHP, it's important to convert between UNIX timestamps and MySQL timestamps when interacting with a database.

// Convert a UNIX timestamp to a MySQL timestamp
$unixTimestamp = time();
$mysqlTimestamp = date('Y-m-d H:i:s', $unixTimestamp);
echo $mysqlTimestamp;

// Convert a MySQL timestamp to a UNIX timestamp
$mysqlTimestamp = '2022-01-01 12:00:00';
$unixTimestamp = strtotime($mysqlTimestamp);
echo $unixTimestamp;