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run code in 150+ php & hhvm versions
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<?php $className = "Model_FeedMonitor"; echo strtolower(preg_replace('/([a-z])([A-Z])/', '$1_$2', $className)); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
model_feed_monitor