引用做什么

时间：2011-05-16 15:58:23 来源：站内作者：潘春会

      // (etc.)
      $last =& $last[$value];
      }

      if (isset($last))
      {
      // At this point, copy the $row into our output array
      if ($dupl) $last[$cx] = $row; // Keep previous
      else    $last = $row; // Overwrite previous
      }
      unset($last); // Break the reference
    }
    else return NULL;

    // Done
    return $out;
}

// A sample result set to test the function with
$data = Array(Array('name' => 'row 1', 'foo' => 'foo_a', 'bar' => 'bar_a', 'baz' => 'baz_a'),
      Array('name' => 'row 2', 'foo' => 'foo_a', 'bar' => 'bar_a', 'baz' => 'baz_b'),
      Array('name' => 'row 3', 'foo' => 'foo_a', 'bar' => 'bar_b', 'baz' => 'baz_c'),
      Array('name' => 'row 4', 'foo' => 'foo_b', 'bar' => 'bar_c', 'baz' => 'baz_d')
      );

// First, let's key it by one column (result: two-dimensional array)
print_r(array_key_by

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