<?php

$products = [
    [ "id"=>1, "name"=>"vaj", "price"=>1.8 ],
    [ "id"=>2, "name"=>"kenyér", "price"=>0.8 ],
    [ "id"=>3, "name"=>"tej", "price"=>0.9 ]
];

$table = file_get_contents('templates/table.html');

$rows = '';
foreach($products as $product) {
    $tr = file_get_contents('templates/tr.html');
    $tr = str_replace('{{ id }}', $product['id'], $tr);
    $tr = str_replace('{{ name }}', $product['name'], $tr);
    $tr = str_replace('{{ price }}', $product['price'], $tr);
    $rows .= $tr;
}
echo str_replace('{{ tableBody }}', $rows, $table);