I am creating a form to set publish interval and want to sum all of the submitted values into seconds. The form consist of fields to determine seconds, minutes, hours, day and so on.
I am collecting the submitted values to string by giving date attributes, like second, minute etc.
For example:
$second second
$minute minute
$hour hour
So if user input 1 in input field to determine the interval in day and 30 in minute, then my code will convert it to string 1 day and 30 minute.
My questions:
1- How can I convert 1 day and 30 minute string into seconds so they can be summed up into correct seconds.
I tried to use strtotime() but it returns a very large number of seconds and date() but it return too small number.
2- Is there a simple function like strtotime() and date() that can do string to second conversion correctly?