What potential issue could arise when using the date() function with the timestamp value from a MySQL table?

When using the date() function with a timestamp value from a MySQL table, the issue that could arise is that the timestamp value may not be in the correct format for the date() function to parse. To solve this issue, you can use the strtotime() function to convert the timestamp value into a Unix timestamp that can be properly formatted by the date() function.

// Assuming $timestamp is the timestamp value from the MySQL table
$timestamp = strtotime($timestamp);
$date = date('Y-m-d H:i:s', $timestamp);
echo $date;