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我一直在試圖解決這一問題的錯誤做準備():PHP Fatal error: Call to a member function prepare() on string in /home/...../lib/library.php on line 91
我也檢查此鏈接:Reference - What does this error mean in PHP? ,我似乎不知道如何把它與我的問題在眼前。誰能幫忙?這是腳本行受到影響:如何解決調用一個成員函數的字符串
public function Login($username, $password)
{
try {
$db = DB();
$query = $db->prepare("SELECT user_id FROM users WHERE (username=:username OR email=:username) AND password=:password");
$query->bindParam("username", $username, PDO::PARAM_STR);
$enc_password = hash('sha256', $password);
$query->bindParam("password", $enc_password, PDO::PARAM_STR);
$query->execute();
if ($query->rowCount() > 0) {
$result = $query->fetch(PDO::FETCH_OBJ);
return $result->user_id;
} else {
return false;
}
} catch (PDOException $e) {
exit($e->getMessage());
}
}
'DB()'沒有返回PDO'的'一個實例。參見http://php.net/manual/en/book.pdo.php和http://stackoverflow.com/questions/5346186/pdo-call-toa-a-member-function-prepare-on-a-non -目的 –