要读取网页上一个json内的数据内容，先将json内容保存为了多个json文件，然后将json字段提取出来保存在其他文件里面。

<?php
if(0)
{
 $prefix="rd";      
 $jsonfile = "rd-1.json,rd-2.json";
}
else
{
 $prefix="all"; 
 $jsonfile = "all-1.json,all-2.json,all-3.json,all-4.json,all-5.json,all-6.json,all-7.json,all-8.json";
}
$file = $prefix."-".date('Ymd').".txt"; 
$arr = explode(',', $jsonfile);
for($idx=0;$idx<count($arr);$idx++)
{
    $json=file_get_contents($arr[$idx]);
    $J=json_decode($json);   
    echo "通过下面的信息就可以获取里面的信息了</br>";  
    print_r($J);   
    printf(count($J->Data->users));
    for($i=0;$i<count($J->Data->users);$i++)
    {
        print_r($J->Data->users[$i]->name."\r\n"); 
        file_put_contents($file,$J->Data->users[$i]->name."\r\n", FILE_APPEND);
        
    }  
}
?> 

php 提取json字段 参考了下面这个

<?php   
$json=  
'{  
"item1":  
{"item11":{"n":"chenling","m":"llll"},"sex":"男","age":"25"},  
"item2":  
{"item21":"ling","sex":"女","age":"24"}  
}';    
$J=json_decode($json);   
echo "通过下面的信息就可以获取里面的信息了</br>";  
print_r($J);  
print_r("</br>");  
echo "测试访问对象内元素</br>";  
print_r($J->item1->item11->n."</br>");   
print_r($J->item1->sex."</br>");   
//注意不是标准的json  
print_r($J->item2->age."</br>");   
?>  

Referenced from:https://blog.csdn.net/zhoushengbin3/article/details/8174123
php 提取json字段 搜索到了下面这个

<?php
    $json = '{"state":"1","info":"登录成功"}';
    $arr = (array) json_decode($json,true);
    echo '状态码：'. $arr['state'];
 
    $json2 = '{"data":{"date":"2019-02-09","team":"第二学期"}}';
    $arr2 = (array) json_decode($json,true);
    echo '日期：'. $arr2['data']['date'].'学期：'.$arr2['data']['team'];
?>

Referenced from:https://blog.csdn.net/qq_17497931/article/details/87733372

func strtime2unix(strtime string) int {
    tm2, _ := time.Parse("20060102150405", strtime)
    fmt.Println(tm2.Unix())
    return int(tm2.Unix())
}

c/c++中使用mktime时，有时候会返回-1错误，主要的原因是输入了非法值，下面是一些常用的示例

#include <bits/stdc++.h>
#include <ctime>
#include <cstdio>
using namespace std;
//g++ mktime.cpp -std=c++11 -o mktime
int main(int argc, char* argv[])
{
    cout<<"mktime example"<<endl;
    struct tm stm;
    stm.tm_sec = 0;
    stm.tm_min = 0;
    stm.tm_hour = 0;
    stm.tm_mday = 1;
    stm.tm_mon = 0;
    stm.tm_year = 70;
    time_t ret;
    setenv("TZ","Etc/GMT",1);
    tzset();
    ret = mktime(&stm);
    printf("Etc/GMT ret = %ld\n", ret);
    setenv("TZ","Europe/Berlin",1);
    tzset();
    ret = mktime(&stm);
    printf("UTC+01:00 ret = %ld\n", ret);
    setenv("TZ","Atlantic/Azores",1);
    tzset();
    ret = mktime(&stm);
    printf("UTC-01:00 ret = %ld\n", ret);
    setenv("TZ","Asia/Shanghai",1);
    tzset();
    ret = mktime(&stm);
    printf("Asia/Shanghai ret = %ld\n", ret);
}

编译，运行，结果

g++ mktime.cpp -std=c++11 -o mktime
./mktime
mktime example
Etc/GMT ret = 0
UTC+01:00 ret = -3600
UTC-01:00 ret = 3600
Asia/Shanghai ret = -28800

Referenced from:https://jp.cybozu.help/general/zh/admin/list_systemadmin/list_localization/timezone.html

需要注意的是：
time():返回自00:00:00 UTC, January 1, 1970到現在所經過的秒數,注意,是UTC，中文默认时间是CST，也是UTC+08:00

示例文件main.proto

syntax = "proto3";
package main;

message Test {
    string comment = 1;
}

message Example {
    string name = 1;
    int32 age = 2;
    repeated Test t = 3;

    message Label {
        string source = 1;
    }
    repeated Label labels = 4;
}

示例文件main.txt

name: "Larry"
age: 99
t: [{comment: "hello"}, {comment: "world"}]
labels: [{source: "foo"}, {source: "bar"}]

protoc --encode编码

protoc --encode=main.Example main.proto < main.txt > main.bin

查看main.bin的内容

hexdump -C main.bin 

00000000 0a 05 4c 61 72 72 79 10 63 1a 07 0a 05 68 65 6c |..Larry.c....hel|
00000010 6c 6f 1a 07 0a 05 77 6f 72 6c 64 22 05 0a 03 66 |lo....world"...f|
00000020 6f 6f 22 05 0a 03 62 61 72 |oo"...bar|
00000029

protoc --decode编码

protoc --decode=main.Example main.proto < main.bin 

name: "Larry"
age: 99
t {
comment: "hello"
}
t {
comment: "world"
}
labels {
source: "foo"
}
labels {
source: "bar"
}

package main

import (
    "encoding/binary"
    "encoding/hex"
    "fmt"
    "log"
    "strings"

    "golang.org/x/text/encoding/simplifiedchinese"
)

您可以在结果上调用 strings.ToUpper() :

src := []byte("const.net.cn")
s := hex.EncodeToString(src)
fmt.Println(s)
s = strings.ToUpper(s)
fmt.Println(s)

或者，您可以将 fmt.Sprintf() 与%X动词一起使用:

s = fmt.Sprintf("%X", src)
fmt.Println(s)

函数实现

func string2hex(s string) string {
    src := []byte(s)
    encodedStr := hex.EncodeToString(src)
    encodedStr = strings.ToUpper(encodedStr)
    return encodedStr
}