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<?php $products = array( 'CATEGORY' => array( 0 => 'book', 1 => 'book', 2 => 'desk', ), 'DESCRIPTION' => array( 0 => 'Bar', 1 => 'sdfadasfdasfas', 2 => 'Barrrr', ), ); echo "Before:\n"; print_r($products); echo "\nAfter:\n"; $cat_to_index = ''; foreach (array_values(array_unique($products['CATEGORY'])) as $category => $uniq_cat) { $keys = array_keys($products['CATEGORY'], $uniq_cat); if (0 < count($keys)) { // Occur more than once $cat_to_index .= join(", ", $keys) . "\n"; } } print_r($cat_to_index); ?>
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