Explaination question Custom Button

Hi,

I do not know what happens, can somebody please explain.
I want to write an array to a text document.

Whatever i do, i receive only the last row of the array. "Bread"
My main perpose is to query with a custom button to the Order Table and take out all the rows related to the PreOrder Table.
$data = $button->getCurrentRecord();

$som1 = str_pad($data["id"],7,0,STR_PADLEFT);

$idvalue = "ORDER".$som1 ;
$myFile = ("Orders/Article".$idvalue.".dds");
$foodArray = ["Eggs", "Bacon", "HashBrowns", "Beans", "Bread"];
foreach ($foodArray as $food) {

$fh = fopen($myFile, 'w') or die("can't open file");

$stringData = $food ."\r\n";

fwrite($fh, $stringData);

}

fclose($fh);
$num = 0;
while ( $num < $y )
{
// print $num . " ";
exec ("Orders/".$myFile.".dss");

exec ("Orders/".$myFile1.".dss");

$num++;
}