<?php
100 => 23,
500 => 5,
1000 => 0,
5000 => 200);
for($z = 0; $z <= count($bills);$z++) { if($bills[$z] = 0){
}
}
echo $bills[2];
PD9waHAKCiRiaWxscyA9IGFycmF5KAoJMTAwID0+IDIzLAoJNTAwID0+IDUsCgkxMDAwID0+IDAsCgk1MDAwID0+IDIwMCk7CgkKCgkKZm9yKCR6ID0gMDsgJHogPD0gY291bnQoJGJpbGxzKTskeisrKSB7CglpZigkYmlsbHNbJHpdID0gMCl7CgkJdW5zZXQoJGJpbGxzWyR6XSk7Cgl9Cn0KCmVjaG8gJGJpbGxzWzJdOw==