PHP: Prepared statements (newbie) getting this error - php

Question

I am a newbie to prepared statements and trying to get something simple to work.
This is my DB table:
`unblocker_users` (
`uno` bigint(20) NOT NULL AUTO_INCREMENT,
`user_email` varchar(210) DEFAULT NULL,
`pw_hash` varchar(30) DEFAULT NULL,
`email_confirmed` tinyint(4) DEFAULT NULL,
`total_requests` bigint(20) DEFAULT NULL,
`today_date` date DEFAULT NULL,
`accessed_today` tinyint(4) DEFAULT NULL,)
and this is my function to insert some test data
function add_new_user($e_mail1)
{
require_once "db.php";
// ####### Below line is giving an error ########
$stmt = $mysqli->prepare("INSERT INTO unblocker_users VALUES ("",?, ?,0,0,?,0)");
$stmt->bind_param('sss', $e_mail1, $this->genRandomString(1),$this->today_date());
$stmt->execute();
$stmt->close();
$done = $stmt->affected_rows;
return $done;
}
As you can see above, i have marked the line that is giving me an error.
The error is" Parse error: syntax error, unexpected T_CONSTANT_ENCAPSED_STRING in..."
Where did I go wrong?

Answer 1

This line might be causing a problem
$stmt = $mysqli->prepare("INSERT INTO unblocker_users VALUES ("",?, ?,0,0,?,0)");
See you close and open the string again in the values, change "" to '' Thats all I could see from a quick glance.

Answer 2

You have " with a double quoted string. PHP thinks
"INSERT INTO unblocker_users VALUES ("",?, ?,0,0,?,0)"
is 2 strings:
"INSERT INTO unblocker_users VALUES ("
",?, ?,0,0,?,0)"
but doesn't what you want to do with them.
change the outside quotes to single quotes and it should work:
'INSERT INTO unblocker_users VALUES ("",?, ?,0,0,?,0)'

Answer 3

"INSERT INTO unblocker_users VALUES ("",?, ?,0,0,?,0)"
In php if you want to use double quotes within double quotes, you must escape the inner ones
"INSERT INTO unblocker_users VALUES (\"\",?, ?,0,0,?,0)"
Or use single quotes as outer ...
'INSERT INTO unblocker_users VALUES ("",?, ?,0,0,?,0)'
... or inner quotes
"INSERT INTO unblocker_users VALUES ('',?, ?,0,0,?,0)"
As far as I know mySQL use single quotes anyway