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<?php $name = "survey_que3"; $key=explode("survey_que",$name); if(sizeof($key) == 2 && is_numeric($key[1]) && $key[0] == "") { print_r($key); }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => [1] => 3 )