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<?php $tags = array( array('tag_id' => 1, 'tag_name' => 'Hello', 'album_id' => 1), array('tag_id' => 1, 'tag_name' => 'Hello', 'album_id' => 2), array('tag_id' => 2, 'tag_name' => 'World', 'album_id' => 1), array('tag_id' => 2, 'tag_name' => 'World', 'album_id' => 2), array('tag_id' => 3, 'tag_name' => 'Again', 'album_id' => 3) ); //$org_tags = array(); //foreach ($tags as $tag) { //} print_r(array_column('album_id', $tags));

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