php测试数据库连接

<?php
$conn = mysql_connect('127.0.0.1','root','123');
var_dump($conn);


echo "<br/>";


mysql_connect("172.16.2.30","msgwl","126wlxc!~");
mysql_select_db("mashanggou");






$check_query = mysql_query("select * from tb_cat ");
$check_query2 = mysql_query("select * from tb_cat ");
echo "<br/>";
var_dump($check_query);
echo "<br/>";
var_dump($check_query2);
echo "<br/>";
?>