What are the implications of using 7*24*60*60 to determine the expiration time of a cached file in PHP?

Using 7*24*60*60 to determine the expiration time in PHP may lead to potential issues if the server's timezone is different from the timezone used in the calculation. To avoid this problem, it's recommended to use PHP's built-in functions like strtotime() or DateTime to set the expiration time based on the current server time. 

// Using PHP's strtotime function to set the expiration time to 7 days from the current server time
$expiration_time = strtotime('+7 days');

// Using DateTime object to set the expiration time to 7 days from the current server time
$expiration_time = new DateTime();
$expiration_time->modify('+7 days');
$expiration_time = $expiration_time->getTimestamp();

Keywords

time calculation caching file expiration PHP timestamp

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