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<?php $alpha = 'aabbccddeeffgghhiijjkk'; $alphaArray = str_split($alpha); $uniqArray = array_unique($alphaArray); $diff = array_diff_assoc($alphaArray, $uniqArray); var_dump($diff);
Output for git.master, git.master_jit, rfc.property-hooks
array(11) { [1]=> string(1) "a" [3]=> string(1) "b" [5]=> string(1) "c" [7]=> string(1) "d" [9]=> string(1) "e" [11]=> string(1) "f" [13]=> string(1) "g" [15]=> string(1) "h" [17]=> string(1) "i" [19]=> string(1) "j" [21]=> string(1) "k" }

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