How turn txt file into an associative array that I am able to acess to? (PHP)

I am doing a school project where I have to open a txt file and acess a list of furniture and their prices. The following is the format;

Dining Table, 595.00
Dining Chair, 145.00
Coffee Table, 259.99

I want to basically put them into an associative array with keys and values that I can acess to, so I can quickly calculate the prices of what the customers ordered and the quantity.

$filename = "Furniture.txt";
$myfile = fopen($filename, "r") or die("Unable to open file!");
while(!feof($myfile)) {
  $data = array(fgets($myfile)."<br>");
}

    $IDArray = array();
    foreach($data as $line)
    {
        $pieces = explode(',',$line);
        $IDArray[$pieces[0]] =   $pieces[1];      
    }
    foreach ($IDArray as $IDNumber =>$Price) {
        echo "Furniture: ".$IDNumber. '<br>';
        echo "Price: ".$Price. '<br>';
        echo "<br>";
        var_dump($data);

This was my attempt but when I try to echo..it only comes up with the last key and pair and not all of the content.