date sort : Array sort « Data Structure « PHP






  1. PHP
  2. Data Structure
  3. Array sort

date sort

 
<?
function date_sort($a, $b) {
    list($a_month, $a_day, $a_year) = explode('/', $a);
    list($b_month, $b_day, $b_year) = explode('/', $b);

    if ($a_year  > $b_year ) return  1;
    if ($a_year  < $b_year ) return -1;

    if ($a_month > $b_month) return  1;
    if ($a_month < $b_month) return -1;

    if ($a_day   > $b_day  ) return  1;
    if ($a_day   < $b_day  ) return -1;

    return 0;
}

$dates = array('12/14/2000', '08/10/2001', '08/07/1999');
usort($dates, 'date_sort');
?>








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