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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) ); $org_tags = array(); print_r(array_column($tags, 'album_id', 'tag_id'));
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [1] => 2 [2] => 2 [3] => 3 )

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