- strcmp: documentation ( source)
- preg_match: documentation ( source)
- trim: documentation ( source)
- str_split: documentation ( source)
<?php
$input = trim(getUserInput());
if(
str_split($input) == array(0,0,0,0) ||
strcmp($input, "0000") == 0 ||
strcmp($input, "000") == 0 ||
strcmp($input, "00") == 0 ||
strcmp($input, "0") == 0 ||
$input === 0 ||
preg_match("/^[\d]{1,}$/D", $input)
)fail_advanced_1();
if($input == "0000") complete_advanced_1();
?>