smallest number but not zero

im feeling dont know what but i am stuck on this problem....please help
how can i get the smallest number from these six variables

$Price10 =23;
$Price14 =43;
$Price18 =29;
$PriceSLV =0;
$PriceGF10 =0;
$PriceGF20 =0;

but it should not be zero. i used min php function but it gives zero as result

 

i have used this sort of logic

$arr = array(44,0,0,12,0,4);

sort($arr);
if($arr[0]!=0)
{
print_r($arr[0]);
}
elseif($arr[1]!=0)
{
print_r($arr[1]);
}
elseif($arr[2]!=0)
{
print_r($arr[2]);
}
elseif($arr[3]!=0)
{
print_r($arr[3]);
}
elseif($arr[4]!=0)
{
print_r($arr[4]);
}
else{
print_r($arr[5]);
}

 

An idea:

<?php
/*
$Price10 =23;
$Price14 =43;
$Price18 =29;
$PriceSLV =0;
$PriceGF10 =0;
$PriceGF20 =0;
*/

//instead of using seperate variable, why dont use array?

$price = array ( // where $price[0] = your $Price10
0 => 23,
43,
29,
0,
0,
0
);

sort($price,SORT_NUMERIC);

$price = array_unique($price);

if ($price[0] == 0) {
$lowest = 1; // 1 = the index of array that carry the lowest value 
} else {
$lowest = 0; // 0 = the index of array that carry the lowest value 
}

//to use so the lowest value
$use = $price[$lowest];

// debug
//var_dump($price);

?>

PHP:

 

nice suggestion dear...thanks for this soloution as well