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run code in 200+ php & hhvm versions
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<?php $sql = "SELECT * FROM ?i WHERE id = ?i"; preg_match_all('(\?[nsiuap])u', $sql, $placholders); print_r($placeholders); ?>
based on R6EN2
Output for 5.0.4 - 7.2.0
Notice: Undefined variable: placeholders in /in/EQJXM on line 4
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: placeholders in /in/EQJXM on line 4