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run code in 150+ php & hhvm versions
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<?php $numbers = '8234jfr98j4fnui4hfj3289rj8'; $numbers = preg_replace('/[a-z]/si', 'a', $hash); $numbers = explode('a', $numbers); print_r($numbers);
Output for 5.0.4 - 7.1.0
Notice: Undefined variable: hash in /in/0jucW on line 3 Array ( [0] => )
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: hash in /in/0jucW on line 3 Array ( [0] => )