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JavaScriptからPHPにデータを渡してjsonで保存する

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クライアントからの情報をサーバーに残しておきたい。
でもデータベースを使うほどのものでもない。
そんな時は配列としてjsonでファイルを保存してしまう。

script.js
async function save(num1, num2){
    let req = await fetch("./save.php",{
        method: "post",
        headers: {"Content-Type": "application/json"},
        body: JSON.stringify([num1,num2]),
    });
}

save(2,1);
save.php
<?php
    $postData = json_decode(file_get_contents("php://input"),true);//jsからjson受け取り
    file_put_contents("./data.json", json_encode($postData));//jsonファイルを保存
?>

保存したjsonは頑張れば見られるし、リファラーのチェックとかも必要なので注意。

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