[RESOLVED] Sorting an array by part of an ellement

nidge

I have a session array that olds information about a booking date that is collected by various form checkboxes:
<input name="book[]" type="checkbox" value="'.$page_id.', '. $accomName. ', ' .$date.'" ' />
So the one value as three pieces of information in them that I can later use by breaking each value apart.

The problem is the session array that holds these values. When the user adds dates they only show in the order that they have selected them. I want to sort the session array based on the date that forms part of its value.

Hope this makes sense

Thanks

laserlight

The "cheating method" is to change the values such that the date comes before the name and page id, thus a normal ordering by the value will result in the desired order 🙂

Another way is to use [man]usort/man so as to specify a custom comparison.

nidge

Thanks for your reply and your solution

I have used the easy method and made the date the first value, I also needed to use the sort function and it works

How complex would it have been to use the usort? I have looked around to see how I could have used it but I did not find any examples that did what I wanted it to do.

Thanks

laserlight

Basically, you need to write a function to extract the date on both the values being compared, e.g., by using [man]explode/man, and compare the respective dates only.

nidge

Thankyou for your time, I will look into this and in the meantime make do with the easy method.

laserlight

You're welcome, and remember to mark this thread as resolved (if it is) using the thread tools 🙂

nidge

Sorry to be a pain, but which tool do I use, I can't seem to see it

Weedpacket

The menu at the top of the thread labelled 'Thread Tools'; there's an option on there called "Mark This Thread Resolved".