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<?php $string = 'lognstring'; $segmentLength = 3; $totalLength = strlen($string); for ($i = 0; $i < $totalLength; $i += $segmentLength) { $result[] = substr( $string, min($totalLength - $segmentLength, $i), $segmentLength ); } var_export($result);

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25.7 ms | 406 KiB | 5 Q