<?php
class lists
{
    public $toolDir;
    public $toolUrl;

    public function __construct($toolDir = __DIR__ . '/../', $toolUrl = 'https://zip358.com/tool/')
    {
        $this->toolDir = $toolDir;
        $this->toolUrl = $toolUrl;
    }

    public function getList($dir = 'demo', $max = 999)
    {
        $response = [];

        for ($i = 0; $i <= $max; $i++) {
            $demoDir = $dir . ($i ?: '');
            if (file_exists($this->toolDir . $demoDir . '/index.php')) {
                $response[] = $this->toolUrl . $demoDir . '/';
            } elseif (file_exists($this->toolDir . $demoDir . '/index.html')) {
                $response[] = $this->toolUrl . $demoDir . '/';
            } else {
                $filelist = scandir($this->toolDir . $demoDir, 1);
                foreach ($filelist as $file) {
                    $fileInfo = pathinfo($file);
                    $basename = $fileInfo["basename"];
                    $filename = $fileInfo["filename"];
                    if ($basename != $filename && $fileInfo["extension"] == "php") {
                        $response[] = $this->toolUrl . $demoDir . '/' . $filename . '.php';
                    }
                }
            }
        }
        return $response;
    }
}

<?php
require 'lists.php';
$res = (new lists())->getList();

document.getElementById('btn').addEventListener('click', () => {
    const formData = new FormData();
    formData.append('id', document.getElementById('id_number').value);
    formData.append('_method','PUT');//DELETE・PATCH・PUT

    fetch('ajax-test', {
        method: 'POST',
        headers: {'X-CSRF-TOKEN': document.querySelector('meta[name="csrf-token"]').content}, // CSRFトークン対策
        body: formData
    })
        .then(response => response.json()) 
        .then(res => {
            console.log('res: '+res[0].id);
            document.getElementById("result").innerHTML = "ID番号" + res[0].id + "は「" + res[0].name + "」です。価格は「" + res[0].price+"円」です。";
        })
        .catch(error => {
            console.log(error); // エラー表示
        });
});

"use strict";
var csv = {
	load:async function(filename,id){
		const responseFile = await fetch(filename);
        const result = await responseFile.text()
		let separate1 = /\r\n/;
		let separate2 = ",";
		let data = (result.split(separate1)).map(function(value){
			return (value.split(separate2)).map(function(value1){
				return value1;
			});
		});
		let sum =[];
		for (const usedata of data) {
            (usedata).map(function(val,index,array){
                sum[index] = (isNaN(parseInt(sum[index]))?0:parseInt(sum[index])) + parseInt(array[index]);
            });
		}
        console.log(sum);
		document.getElementById(id).innerHTML = sum.join(",");
		return "OK";
	}
};
csv.load("math.csv?", "sum");

<?php
//$_POST["sh"]...検索キーワード 
if ($_POST["sh"]) {
	$sh = urlencode(@xss_defence($_POST["sh"]));
	$res = simplexml_load_file("https://news.google.com/news/rss/headlines/section/q/$sh/?ned=jp&hl=ja&gl=JP");
	rss($res);
}
function rss(object $obj = null):void
{
	if (isset($obj->channel->item)) {
		if ($obj->channel->item) {
			$cnt = 0;
			foreach ($obj->channel->item as $item) {
				$result[$cnt]["title"] = (string)$item->title;
				$result[$cnt]["link"] = (string)$item->link;
				$result[$cnt]["pubDate"] = (string)$item->pubDate;
				$result[$cnt]["description"] = (string)$item->description;
				$result[$cnt]["source"] = (string)$item->source;
				$cnt++;
			}
		}
	}
	echo json_encode($result);
}

function xss_defence(mixed $val):mixed
{

    if(!isset($val))return false;
    if(is_array($val)){
        foreach ($val as $key => $value) {
            # code...
            $val[$key] = strip_tags($value);
            $val[$key] = htmlentities($val[$key],ENT_QUOTES);
        }
    }else{
        $val = strip_tags($val);
        $val = htmlentities($val,ENT_QUOTES);
    }
    return $val;
}