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run code in 150+ php & hhvm versions
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<?php $str = '152.15 x 12.34 x 11mm'; preg_match_all('!\d+(?:\.\d+)?!', $str, $matches); $floats = array_map('floatval', $matches[0]); print_r($floats);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [0] => 152.15 [1] => 12.34 [2] => 11 )
Output for hhvm-3.10.0

Process exited with code 153.