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run code in 150+ php & hhvm versions
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<?php $key = 'abc+3'; preg_match('/\+([0-9]*)/', $key, $test); var_dump($test);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(2) { [0]=> string(2) "+3" [1]=> string(1) "3" }