警告：mysqli_query（）期望參數1爲mysqli，第16行給出的字符串爲

Question

$result=mysqli_query($connection,$query); 
if(mysqli_affected_rows($connection)==1) 

Answer 1

您的$連接參數以字符串形式給出，而它應該是mysqli對象。從php docs：

$link = mysqli_connect("localhost", "my_user", "my_password", "world"); 

/* check connection */ 
if (mysqli_connect_errno()) { 
    printf("Connect failed: %s\n", mysqli_connect_error()); 
    exit(); 
} 

/* Create table doesn't return a resultset */ 
if (mysqli_query($link, "CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) { 
    printf("Table myCity successfully created.\n"); 
}