How do I Sort a Multidimensional Array in PHP [duplicate]

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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.

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