简单的mysqli_query SELECT返回false

Question

我真的不明白为什么以下转储我bool（假）

 // Create connection $conn = mysqli_connect($servername, $username, $password); // Check connection if (!$conn) { die("Connection failed: " . mysqli_connect_error()); } echo "Connected successfully"; $sql = "SELECT id FROM maxims ORDER BY RAND() LIMIT 1"; var_dump(mysqli_query($conn, $sql)) or die(mysql_error()); 

Answer 1

 mysqli_connect("myhost","myuser","mypassw","mydb");

 e.g

 $conn = mysqli_connect('localhost','user','password','database1');

http://php.net/manual/en/function.mysqli-connect.php