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<?php $UUID = "f9e113324bd449809b98b0925eac3141"; echo preg_replace('/(?:^[\da-f]{4})?[\da-f]{4}\K/', '-', $UUID, 4); echo "\n---\n"; vprintf('%s-%s-%s-%s-%s', sscanf($UUID, '%8s%4s%4s%4s%12s')); echo "\n---\n"; echo implode('-', sscanf($UUID, '%8s%4s%4s%4s%12s'));

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