mysql - PHP script cannot access database in sql -

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i trying connect mysql database through php script. gives me error mysql_error(): access denied user '@localhost' database 'userinfo'

userinfo database.

my script this

<?php $servername = "localhost"; $username = "root"; $password = "'mm'"; $database = "userinfo"; $conn = mysqli_connect($servername, $username, $password);  if (!$conn) {     die("connection failed: " . mysqli_connect_error()); }  echo "connected successfully<br>";  mysql_select_db($database) or die(mysql_error());  echo "connected db:" . $database . "<br>"; ?>

you connecting using 

mysqli_

function , selecting data with

mysql_

avoid using both @ same time. since they're incompatible. use mysqli_ alternative instead

mysqli_select_db($conn, $database);

and

mysqli_error($conn)

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