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Message: Undefined variable: 0 in CodeIgniter PHP


Sometime while working with CodeIngiter / PHP you may encounter "Undefined variable: 0" error.
It surprise to that is "0" (Zero) could be a variable!


This "Undefined variable: 0" error come when you use double dollar sign in variable. so remove one dollar ($) sign from variable and error will gone.


See the below code, specially in red color, it having $$ sign:

$data = array( 'u_login' => $row->u_login,
                        'user_type_id' => $user_type_id,
'pump_id'=> $$pump_id

jut remove one $ sign.