php - mysql_connect 有效，mysqli 无效

Question

奇迹般有效：

mysql_connect('localhost') or die('Could not connect to MySQL database');
mysql_select_db('k') or die('Couldnt select MySQL database in connect.php');

这两个都因内部服务器错误（500）而失败

$mysqli = new mysql('localhost',null,null,'k');
$mysqli = new mysql('localhost','','','k');

Answer 1

你错过i了mysqli

$mysqli = new mysql('localhost',null,null,'k');
$mysqli = new mysql('localhost','','','k');

应该

$mysqli = new mysqli('localhost',null,null,'k');
$mysqli = new mysqli('localhost','','','k');

Answer 2

它应该是new mysqli(..而不是new mysql(..：

$mysqli = new mysqli('localhost',null,null,'k');
$mysqli = new mysqli('localhost','','','k');

检查构造函数的手册