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run code in 150+ php & hhvm versions
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<?php $name = 'SlimDuct 3-3/4" Ivory 90° Flat Elbow SK100I'; $str = strtolower(trim(preg_replace('/[^a-zA-Z0-9]+/', '-', $name), '-')); echo $str. "\n"; ?>
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
slimduct-3-3-4-ivory-90-flat-elbow-sk100i
Output for hhvm-3.10.0

Process exited with code 153.