Question

我需要使用PHP从JSON数组中随机获取任意5组数据。我在下面解释我的代码。

$result = array(
    array(
        'cat_id'=>'2',
        'cat_name'=>'spirit',
        'subcat_id'=>'20',
        'subcat_name'=>'pizza'
        ),
    array(
        'cat_id'=>'3',
        'cat_name'=>'Food',
        'subcat_id'=>'23',
        'subcat_name'=>'pakhal'
        ),
    array(
        'cat_id'=>'2',
        'cat_name'=>'spirit',
        'subcat_id'=>'22',
        'subcat_name'=>'wine'
        ),
    array(
        'cat_id'=>'2',
        'cat_name'=>'spirit',
        'subcat_id'=>'20',
        'subcat_name'=>'pizza'
        ),
    array(
        'cat_id'=>'3',
        'cat_name'=>'Food',
        'subcat_id'=>'24',
        'subcat_name'=>'fuddy'
        ),
    array(
        'cat_id'=>'4',
        'cat_name'=>'Continetal',
        'subcat_id'=>'25',
        'subcat_name'=>'cont'
        )
    );

echo json_encode($result);

这里我需要从上面的数组中随机获取最多5个数据。

Answer 1

从$ result by array_rand中选择5个随机密钥并获取它们

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

var index = require('./routes/index');
var users = require('./routes/users');
var admin = require('./routes/admin');


var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', index);
app.use('/users', users);
app.use('/admin', admin);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;

如何使用PHP从JSON数组中获取最多5组数据

1 个答案: