自从PHP4.3起，mysql_create_db()函数已被弃用。现在，建议用以下2种代替方案

mysqli_query()
PDO::_query()

PHP MySQLi创建数据库

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<?php
$host = 'localhost:3306';
$user = 'root';  //MySQL用户账户
$pass = '';
$conn = mysqli_connect($host, $user, $pass);
if(!$conn)
{
	die('Could not connect: '.$mysqli_connect_error());
}
echo 'Connected successfully<br/>';

$sql = 'CREATE Database mydb';
if(mysqli_query($conn,$sql))
{
	echo "Database mydb created  successfully.";
}else{
	echo "Sorry，database creation failed ".mysqli_error($conn);
}

mysqli_close($conn);
?>

执行上述代码，输出结果如下：

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Connected successfully
Database mydb created successfuly.