$sql = "insert into user (account,password,mail,phone,) VALUES (". $account.",".$password.",".$mail.",".$phone.")";
$query = $this- > link- > query ($sql);
when inserting data into the database, the VALUES parentheses should be written in the form of variables. Is this correct?
check the representation of PHP strings, the difference between single and double quotes
$sql = "insert into user(account,password,mail,phone) VALUES ('".$account."','".$password."','".$mail."','".$phone."')";suggest that you use sprintf, to be more intuitive
single quotation marks do not resolve variables, double quotation marks resolve variables, just replace single quotation marks with double quotation marks
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