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<?php $FILE[0] = ['artist' => 'a,b']; $FILE[1] = ['artist' => 'c']; $merged = []; for($i=0;$i<2;$i++) { $artist = explode(',', $FILE[$i]['artist']); // Because Artist names saved like this `A,B` in first row and `A,B,C` in second. $merged = array_unique(array_merge($merged, $artist)); } print_r($merged);
Output for rfc.property-hooks, git.master, git.master_jit
Array ( [0] => a [1] => b [2] => c )

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