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run code in 200+ php & hhvm versions
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<?php $string ='2firstword21mytargetstring'; $result = sscanf($string, "%d%s%d%s"); var_dump($result);
Output for 4.3.0 - 7.2.0
array(4) { [0]=> int(2) [1]=> string(25) "firstword21mytargetstring" [2]=> NULL [3]=> NULL }