after solving the SQL I issue ,https://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_28335484.html
now I have one more question on
password requirement for user to register on my site.
What is the "at least x number of character on password" I need to set.
For example, there is a-z , A-Z, 0-9, , ','','#'$'......etc... around 70 characters for one character of password input so if where x is 3, the combination is 70*70*70=343000, right ?
x is 3 that is safe enough for security issue, right ?