Logic

<?php
  class itergame {
  	private $hidenum; 
  	public  $turn;
 
  	function __construct($number = "") {
  		$this->turn = 0;
  		if($number != "") {
  			$this->hidenum = $number;
  		} else {
  			$this->Generate();
  		}
  	}
 
  	public function Generate() {
  		$temp = "";
  			for($i=0; $i<4; $i++) {
  				do 
  				{
  					 $k = mt_rand(1,9);
  	  	  }
  	  	  while( substr_count($temp,$k) > 0 );
  	  	  $temp .= $k;
  			$this->hidenum = $temp;
  	    }
  	}
 
  	public function Eval_n($num) {
  		$r = 0; $b = 0;
  		$nh = str_split($this->hidenum); 
  		if( NumValid($num) ) {
  			for($i=0; $i < 4; $i++) {
  				if( IsThere($num, $nh[$i])) 
  					$r++;
  				if( InPos($num, $nh[$i], $i) )
  					$b++;
 
  				$r -= $b; 
  			}
  			$result = $r." ".$b;
  			$this->turn++;
  	  } else {
  	  	$result = "";
  	  }
 
  		return $result;
  	}
 
  	private function NumValid($num) {
  		$vof = 1;
  		$arr = str_split($num);
  		for($i=0; $i < 4; $i++) {
  			if($arr[$i] < 1 || $arr[$i] > 9) {
  				$vof = 0; 
  				echo "Número Ilegal, cifra fuera de rango\n";
  			}
  		}
  		for($i=0; $i < 4; $i++) {
  			if( substr_count($num, $arr[$i]) > 1 ) {
  				$vof = 0;
  				echo "Número Ilegal, tiene cifras repetidas\n";
  			}
  		}
 
  		return $vof;
  	}
 
  	private function InPos($cad, $n, $ind) {
  		$arr = str_split($cad);
  		$vof = ($arr[$ind] == $n);
  		return $vof;
  	}
 
  	private function IsThere($cad, $n) {
  		$vof = (substr_count($cad, $n) > 0);
  		return $vof;
  	}
 
  }
 
?>