keep getting a syntax error (php / mysql)

Question

php/mysql

I keep getting this error: \"You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use n

Answer 1

The error is coming from this line:

if (!mysqli_query($dbCon,$sql)){

$sql contains the result of

$dbCon->query($add_query);

Since that query was successful, $sql contains TRUE. mysqli_query() requires the second argument to be a string, so TRUE becomes "1", so you're effectively doing:

if (!mysqli_query($dbCon, "1")) {

That's not a valid query, so you get an error.

I think what you really meant to do was:

if (!$sql) {
    die('Error: ' . $dbCon->error);
} else {
    echo "dados atualizados!";
}

You don't need to keep calling mysqli_query() repeatedly.

You should also learn to code using prepared statements instead of substituting variables into the query, to prevent SQL injection.