报错Warning: mysqli::set_charset(): Couldn't fetch mysqli in
<?php
$mysqli=@new mysqli('localhost','root','root','secondclass');
$mysqli->set_charset('utf-8');
$sql=<<<EQF
CREATE TABLE IF NOT EXISTS mysqli(
id TINYINT UNSIGNED AUTO_INCREMENT KEY,
username VARCHAR(45) NOT SQLITE3_NULL
);
EQF;
$res=$mysqli->query($sql);
var_dump($res);
?>
