PHP, Node.js or Go: which backend to choose

<?php
declare(strict_types=1);

// PHP: every request runs this file from scratch — no state to leak between requests
$products = [
    ['sku' => 'A-100', 'title' => 'Oak table', 'price' => 24000],
    ['sku' => 'B-200', 'title' => 'Pine shelf', 'price' => 5000],
];

if (parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH) !== '/api/products') {
    http_response_code(404);
    exit;
}
$max = (int) ($_GET['max'] ?? PHP_INT_MAX);
header('Content-Type: application/json');
echo json_encode(
    array_values(array_filter($products, fn(array $p): bool => $p['price'] <= $max)),
    JSON_UNESCAPED_UNICODE,
);

import { createServer } from 'node:http';

// Node.js: one long-lived process; the event loop serves every request
const products = [
  { sku: 'A-100', title: 'Oak table', price: 24000 },
  { sku: 'B-200', title: 'Pine shelf', price: 5000 },
];

createServer((req, res) => {
  const url = new URL(req.url ?? '/', 'http://localhost');
  if (url.pathname !== '/api/products') {
    res.writeHead(404).end();
    return;
  }
  const max = Number(url.searchParams.get('max') ?? Infinity);
  res.writeHead(200, { 'content-type': 'application/json' });
  res.end(JSON.stringify(products.filter((p) => p.price <= max)));
}).listen(8082);

package main

import (
	"encoding/json"
	"math"
	"net/http"
	"strconv"
)

type Product struct {
	SKU   string `json:"sku"`
	Title string `json:"title"`
	Price int    `json:"price"`
}

var products = []Product{
	{"A-100", "Oak table", 24000},
	{"B-200", "Pine shelf", 5000},
}

// Go: one compiled binary; each request is served in its own goroutine
func main() {
	http.HandleFunc("GET /api/products", func(w http.ResponseWriter, r *http.Request) {
		limit := math.MaxInt
		if v, err := strconv.Atoi(r.URL.Query().Get("max")); err == nil {
			limit = v
		}
		found := []Product{}
		for _, p := range products {
			if p.Price <= limit {
				found = append(found, p)
			}
		}
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode(found)
	})
	http.ListenAndServe(":8083", nil)
}