PHP and JavaScript Question?

[jtorii4]

I need to make a password in php and javascript (with html) so that if the user wants the password to be 6 digits long, then the password is y0z0z2z4z6y2z0z2z4z6y4z0z2z4z6y6z0z2z4z6. If the password is 4 digits long, then the password is y0z0z2z4y2z0z2z4y4z0z2z4.

THESE ARE NOT RANDOM NUMBERS. There is a pattern within those passwords. Can someone please send me their suggestion on how this could be done?

 

[sheldonlinker]

Given n as $n:

for ($y=0; $y<=$n; $y+=2) {
...echo 'y' . $y . 'z';
...for ($z=0; z<=$n; $z+=2)
......echo '' . $z . 'z';
}