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<?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); ?>
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