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<?php $uniqueCount = 0; foreach (array_count_values(str_split('abclkjabc')) as $char => $count) { if ($count === 1) { ++$uniqueCount; } } echo $uniqueCount;
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
3
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72.27 ms | 1475 KiB | 4 Q