mysqli_real_escape_string for int

Question

Help, I've been searching for all solutions on how I can retrieve my data from a table in a database using the primary key.

intval($referenceNumber) = mysqli_real_escape_string($link, $_POST['referenceNumber']);

Then my sql query goes like this..

$sql = "INSERT INTO cleared 
        (referenceNumber, visitorName, visitorID, 
        numberOfCompanions, collegeVisit, reasonVisit, timeIn)
        SELECT *
        FROM visitor
        WHERE referenceNumber = PRIMARY KEY";`

I always get the error: Fatal error: Can't use function return value in write context in C:\\wamp64\\www\\test\\transfer.php on line 13

How can I remove this error? Thanks in advance for the help.

Answer 1

Well you need to first assign the value to the variables and then cast it to an integer. You line 13 should be:

$referenceNumber = mysqli_real_escape_string($link, $_POST['referenceNumber']);

$referenceNumber = intval($referenceNumber);

See the documentation for intval