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run code in 150+ php & hhvm versions
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<?php $string ='2firstword21mytargetstring'; $result = sscanf($string, "%s%d%s"); var_dump($result);
Output for 4.3.0 - 5.6.28, 7.0.0 - 7.1.0
array(3) { [0]=> string(26) "2firstword21mytargetstring" [1]=> NULL [2]=> NULL }
Output for hhvm-3.10.0 - 3.12.0
array(1) { [0]=> string(26) "2firstword21mytargetstring" }