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<?php $file='abactor abaculus abacus Abadite'; $result = []; foreach(str_split($file) as $char) { $result[$char]=isset($result[$char]) ?'*'.$result[$char] :$char; } print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [a] => ******a [b] => ***b [c] => **c [t] => *t [o] => o [r] => r [ ] => ** [u] => **u [l] => l [s] => *s [A] => A [d] => d [i] => i [e] => e )

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