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PHPでlike検索かける方法

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#likeを使った検索方法
###誤った方法

   $lists = $db->prepare('SELECT * FROM example WHERE like "%?%" ;');
    $lists -> execute(array($_SESSION['key']));
}

これだと、%も?もエスケープされていないので、期待した値が得られない

###正しい方法

      $lists = $db->prepare('SELECT * FROM example WHERE  like ? ;');
    $lists -> execute(array('%'.$_SESSION['key'].'%'));
}

つまり、「%」ごと挿入すると考えることが重要であると分かった。

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