Консольный магазин на PHP

<?php
$prod = array( 1=>'Cola', 2=>'Pepsi', 3=>'Bombey', 4=>'Camel' );
$price = array( 1=>10, 2=>20, 3=>30, 4=>40 );
$age1=array (1=>0, 2=>10, 3=>21, 4=>18 );
global $age;
$age=readline("Write your age \n");
 
function Test($a, $b){
    if($a<$b)
    return true;
        return false;
    }
 
 function MultiplePrice($x, $y){
return $x*$y;
}
    
        function Menu($arr, $arr1, $arr2){
        echo "\n \t Menu\n";
        for($p=1; $p<=count($arr); $p++){
echo "$p) $arr[$p], price $arr1[$p], age from $arr2[$p] \n";
}
 
$sum=0;
$urprod=1;
while($urprod!=’0’){
Menu($prod, $price, $age1);
    $urprod=readline("\n Chose your product  (enter 0 or click Enter) \n");
    if($urprod==0){
        break;
    }
    else{
        if($urprod<0 || $urprod>count($prod))
    {
        echo "\nNo matches \n";
    }
    else{
        if(Test($age, $age1[$urprod])){
        echo "\n You are too young \n";
    }
        else{
        echo "\n You`ve chosen $prod[$urprod] \n";
        $quont=-1;
while($quont<0){
        $quont=readline("\n Choose quontity of $prod[$urprod]\n ");
        if($quont>0)
        echo "\n You`ve chosen $quont of $prod[$urprod] \n";
        else
        echo "\n Choose 0 or more items\n";
 
            $chek=MultiplePrice($quont, $price[$urprod]);
            $sum+=$chek;
            echo "Your current sum $sum\n";
}}}}}
    echo "\n Your result sum $sum \n";
        }