Question

php 使用mysqli_insert_id($dbc)一直返回0

if(isset($_POST['submitted'])) {

$message = $_POST['message'];

$send_people = $_POST['send_people'];

$user_id = $_SESSION['user_id'];

$q = "insert into send_message(user_id,user_name,message_id,message_content) VALUES ('" . $user_id . "','" . $user_name . "',NULL,'" . $message . "')";

$id = mysqli_insert_id($dbc);

$r = mysqli_query($dbc, $q);
echo "$id";

for ($i = 0; $i < count($send_people); $i++) {

$q1 = "insert into receive_message (message_id ,receive_id,message_status) values('".$id."','".$send_people[$i]."',0)";

$r1 = mysqli_query($dbc, $q1);

printf("%s",mysqli_error($dbc));

}

}

Answer 1