This awesome function will return an array of rows with the key values of each row matching the column header which should be provided in the first row.

csv_to_json.php

<?php

$array = csv_to_array(file_get_contents('some_file.csv'));
$json = json_encode($array);
echo $json;

/**
 * This awesome function will return an
 * array of rows with the key values of
 * each row matching the column header
 * which should be provided in the first row.
 */
function csv_to_array($file_contents) {
  $objects = array();
  $lines = preg_split('|\s*[\r\n]+\s*|msi', $file_contents);
  $header = array();
  
  foreach ($lines as $index => $line) {
    $values = str_getcsv($line);
    if ( $index == 0 ) {
      $header = $values;
    } else {
      $item = array();
      foreach ($header as $hIndex => $name) {
        $item[$name] = $hIndex < count($values) ? $values[$hIndex] : "";
      }
      $objects[] = $item;
    }
  }
  return $objects;
}

?>