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<?php $string = 'abclkjabc'; $notRepeated = []; foreach (count_chars($string, 1) as $char => $count) { if ($count === 1) { $notRepeated[] = chr($char); } } var_export($notRepeated); echo "\nCount = " . count($notRepeated);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => 'j', 1 => 'k', 2 => 'l', ) Count = 3

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