Why can't I get the content?

If the code is written in the format of {code...}, nothing will happen on the page.

 
  query('SET NAMES utf8');function cd(){global $pdo;return $pdo->lastInsertId();}function qr($var){global $pdo;return $pdo->query($var);}function fo($var){return qr($var)->fetch();}function fa($var){return qr($var)->fetchALL();}$fp=fo('SELECT * FROM post WHERE id=1');echo $fp['title'];echo $fp['content'];?>

In this case, the page is unrealistic.

Reply content:

 
  query('SET NAMES utf8');function cd(){global $pdo;return $pdo->lastInsertId();}function qr($var){global $pdo;return $pdo->query($var);}function fo($var){return qr($var)->fetch();}function fa($var){return qr($var)->fetchALL();}$fp=fo('SELECT * FROM post WHERE id=1');echo $fp['title'];echo $fp['content'];?>

In this case, the page is unrealistic.

 
  Query ('set NAMES utf8'); function cd () {global $ pdo; return $ pdo-> lastInsertId ();} function qr ($ var) {global $ pdo; return $ pdo-> query ($ var);} function fo ($ var) {// The problem lies here, qr ($ var) the value of $ pdo-> query ($ var) is the execution result of an SQL statement, not the object $ pdo. An error occurred while calling fetch. return qr ($ var) -> fetch ();} function fa ($ var) {return qr ($ var)-> fetchALL ();} $ fp = fo ('select * FROM post WHERE id = 1'); echo $ fp ['title']; echo $ fp ['content'];?>