简单mysqli_query SELECT返回false

Simple mysqli_query SELECT returns false

本文关键字：返回 false SELECT query mysqli 简单 | 更新日期: 2023-09-27

我真的不明白为什么下面会转储我bool（false）

// 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());

 mysqli_connect("myhost","myuser","mypassw","mydb");
 e.g
 $conn = mysqli_connect('localhost','user','password','database1');

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