Question

I have CSV data loaded into a multidimensional array. In this way each ‘row’ is a record and each ‘column’ contains the same type of data. I am using the function below to load my CSV file.

function f_parse_csv($file, $longest, $delimiter) {   $mdarray = array();   $file    = fopen($file, 'r');   while ($line = fgetcsv($file, $longest, $delimiter))   {     array_push($mdarray, $line);   }   fclose($file);   return $mdarray; } 

I need to be able to specify a column to sort so that it rearranges the rows. One of the columns contains date information in the format of Y-m-d H:i:s and I would like to be able to sort with the most recent date being the first row.

Answer 1

You can use array_multisort()

Try something like this:

foreach ($mdarray as $key => $row) {     // replace 0 with the field's index/key     $dates[$key]  = $row[0]; }  array_multisort($dates, SORT_DESC, $mdarray); 

For PHP >= 5.5.0 just extract the column to sort by. No need for the loop:

array_multisort(array_column($mdarray, 0), SORT_DESC, $mdarray);