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Link: http://codepad.org/HtvviQuC    [ raw code | output | fork ]

PHP, pasted on Jan 23:
<?php
$raw_data = array(
   array('category_name' => 'Category1', 'channel_name' => 'Item 1'),
   array('category_name' => 'Category3', 'channel_name' => 'Item 2'),
   array('category_name' => 'Category1', 'channel_name' => 'Item 2'),
   array('category_name' => 'Category3', 'channel_name' => 'Item 1'),
   array('category_name' => 'Category2', 'channel_name' => 'Item 2'),
   array('category_name' => 'Category2', 'channel_name' => 'Item 1')
);

$sorted = array();

foreach ($raw_data as $k => $v) {
   if(!array_key_exists($v['category_name'], $sorted )) {
      $sorted[$v['category_name']] = array();
   }
   $sorted[$v['category_name']][] = $v['channel_name'];
   sort($sorted[$v['category_name']]);
}
ksort($sorted);
print_r($sorted);
?>


Output:
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Array
(
    [Category1] => Array
        (
            [0] => Item 1
            [1] => Item 2
        )

    [Category2] => Array
        (
            [0] => Item 1
            [1] => Item 2
        )

    [Category3] => Array
        (
            [0] => Item 1
            [1] => Item 2
        )

)


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