在庫管理の API を PHP で練習。ストレージに JSON のテキストファイル。

readme.txt

http localhost/test/api_stock_list.php
http -f POST localhost/test/api_stock.php id=1 amount=5
http localhost/test/api_stock_reset.php

api_stock.php

<?php
require 'functions.php';

header('Content-Type: application/json');

$id = empty($_POST['id']) ? null : (int) $_POST['id'];
$amount = empty($_POST['amount']) ? null : (int) $_POST['amount'];

if (!is_int($id) || 0 > $id) {
    echo json_encode([
       'msg' => 'id が正の整数ではありません。',
       'id' => $id
    ]);
    exit();
}

if (!is_int($amount) || 0 >= $amount) {
    echo json_encode([
        'msg' => 'amount が空もしくは0以上の整数ではありません。',
        'amount' => $amount
    ]);
    exit();
}

$stock = stock_read();
$check = false;

foreach ($stock as $key => &$value) {
    if ($id === $value['id']) {
        $value['amount'] = $amount;
        $check = true;
        break;
    }
}

if (!$check) {
    echo json_encode(['msg' => '該当する id が存在しませんでした。']);
    exit();
}

stock_save($stock);

echo json_encode(['msg' => 'ok']);

api_stock_list.php

<?php
require 'functions.php';

header('Content-Type: application/json');
echo stock_read_json();

api_stock_reset.php

require 'functions.php';

header('Content-Type: application/json');

$stock = [
    ['id' => 1, 'name' => '唐揚げ弁当', 'price' => 500, 'amount' => 3],
    ['id' => 2, 'name' => '日替わり弁当', 'price' => 600,'amount' => 5],
    ['id' => 3, 'name' => '幕の内弁当', 'price' => 700, 'amount' => 2],
];

stock_save($stock);

echo json_encode(['msg' => 'ok']);

functions.php

<?php

function stock_read()
{
    return json_decode(file_get_contents('stock.json'), true);
}

function stock_read_json()
{
    return file_get_contents('stock.json');
}

function stock_save($array)
{
    file_put_contents('stock.json', json_encode($array));
}