Incorrect value is inserted in database

Question

I have this code:

Answer 1

You are casting it to a number (actually a double) when you bind it to the query. You need to use s instead of d:

$stmt->bind_param('d', $e);

should be

$stmt->bind_param('s', $e);

See the manual on types:

i   corresponding variable has type integer
d   corresponding variable has type double
s   corresponding variable has type string
b   corresponding variable is a blob and will be sent in packets