Double opt tutorial flaw update page… anyway

it is a ternary expresion which is an if statement short handin the form of;

(condition)?true:false

so in this code:
($row_SecurityAssisttblusers['UserEmail'] != $_POST["User_Update_group_Email"])? '0': $row_SecurityAssisttblusers['emailVerified'])

the question is:
($row_SecurityAssisttblusers['UserEmail'] != $_POST["User_Update_group_Email"])?

or in english:
is the email in the recordset different than the email in the post

the true and false responses are:
'0': $row_SecurityAssisttblusers['emailVerified']

so if the answer is yes, it uses the value 0, if the answer is no, it uses the value that is already stored in the emailVerified column of the recordset