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<?php $lowercase = "cats"; $uppercase = "DOGS"; $multiplewords = "the cats and the dogs"; echo strtoupper($lowercase); echo strtolower($uppercase); echo ucfirst($lowercase); echo ucwords($multiplewords); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
CATSdogsCatsThe Cats And The Dogs
Output for hhvm-3.10.0

Process exited with code 153.