PHP与Python交互中JSON数据流的正确处理姿势

# ...
print (out) # 直接打印Python字典的字符串表示

import json
# ...
print(json.dumps(out)) # 将Python字典序列化为JSON字符串

outnews = {html.unescape(currentNews["timestamp"]), html.unescape(currentNews["title"]), html.unescape(currentNews["description"]), html.unescape(currentNews["link"])}

outnews = {html.unescape(currentNews["timestamp"]), html.unescape(currentNews["title"]), html.unescape(currentNews["description"]), html.unescape(currentNews["link"])} # 这是一个集合

outnews = [html.unescape(currentNews["timestamp"]), html.unescape(currentNews["title"]), html.unescape(currentNews["description"]), html.unescape(currentNews["link"])] # 这是一个列表

#!/usr/bin/python
import requests
import json
import html
import sys

requestpost = requests.post('NewsSource')
response_data = requestpost.json()

data = []
status = 0
answers = 0
out = {"data":[], "status":[], "answers":[0]}

searchterm = sys.argv[1]

error = 0

if requestpost.status_code == 200:
    out["status"] = 200
    for news in response_data["news"]:
        try:
            currentNews = json.loads(news)
            if ((html.unescape(currentNews["title"]) != "Array" and html.unescape(currentNews["title"]).lower().find(searchterm.lower()) != -1) or (html.unescape(currentNews["description"]).lower().find(searchterm.lower()) != -1)):
                # 将集合改为列表，以兼容JSON
                outnews = [
                    html.unescape(currentNews["timestamp"]),
                    html.unescape(currentNews["title"]),
                    html.unescape(currentNews["description"]),
                    html.unescape(currentNews["link"])
                ]
                out["data"].append(outnews)
                out["answers"][0] = out["answers"][0] + 1
        except Exception as e: # 捕获更具体的异常
            error += 1
            # print(f"Error processing news item: {e}", file=sys.stderr) # 调试信息
else:
    out["status"] = 404

# 使用 json.dumps() 将Python对象序列化为JSON字符串
print(json.dumps(out))

// ...
$output = json_encode(shell_exec($command)); // 错误：对已是字符串的JSON再次编码
header('Content-type: application/json');
echo $output;

<?php
    if ($_GET['times'] == 0) {
        $command = escapeshellcmd('python3 feed.py '. $_GET['subject']);
        $output = shell_exec($command); // 获取Python脚本的JSON输出

        header('Content-type: application/json');
        echo $output; // 直接输出，不再进行json_encode
    }
?>

<?php
    if ($_GET['times'] == 0) {
        $command = escapeshellcmd('python3 feed.py '. $_GET['subject']);
        header('Content-type: application/json'); // 必须在passthru之前设置Content-type
        passthru($command); // 直接将Python脚本的输出传递给客户端
    }
?>

// 假设后端接口是 /api/data.php?subject=example&times=0
fetch('/api/data.php?subject=example&times=0')
    .then(response => {
        if (!response.ok) {
            throw new Error('Network response was not ok');
        }
        return response.json(); // 直接解析为JavaScript对象
    })
    .then(data => {
        console.log('Parsed JSON data:', data);
        // 现在 'data' 就是一个标准的JavaScript对象，可以直接访问其属性
        console.log('Status:', data.status);
        console.log('First article title:', data.data[0][1]); // 假设是列表中的第二个元素
    })
    .catch(error => {
        console.error('There was a problem with the fetch operation:', error);
    });