unable to sort date using usort

问题

I have user defined function sort which sorts by date. It works fine for the same year and does not work when the year changes. This an example of the dates that is sorted by the function:

 01/02/2013  
 01/03/2013 
 12/12/2012  

 function mysort($a,$b) {
   return $a['date']>$b['date'];
 }

 usort($arr,"mysort");

This is an old application which uses php4. Is there a way where I can compare dates directly?

回答1:

Use strtotime.

function mysort($a,$b) {
    return strtotime($a['date'])>strtotime($b['date']);
}

来源：https://stackoverflow.com/questions/14146520/unable-to-sort-date-using-usort