PHP - Undefined variable

Question

I\'m doing some exercises from Beginners PHP & MySQL by Mr. Tucker.

On his example everything works fine, but on my PC there is an error:

Answer 1

That's because your query returned nothing and your

while ($row = mysql_fetch_array($tUser_SQLselect_Query, MYSQL_ASSOC)) {

didn't fill

$passwordRetrieved

You can disable E_NOTICE notices because it's not something that would hurt

Or add

$passwordRetrieved = "";

before your

while ($row = mysql_fetch_array($tUser_SQLselect_Query, MYSQL_ASSOC)) {